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Recent questions tagged discretemaths
0
votes
0
answers
Gate overflow book
I am having a confusion in precedence order of logical operators. For e.g. consider the expression (a ∧ b) → (a ∧ c) ∨ d. Then how is the expression evaluated? Like is it ((a ∧ b) → (a ∧ c)) ∨ d or (a ∧ b) →((a ∧ c) ∨ d)? ... than implication, so the second one should be correct. But from the solution, I see it is the first one. Link to the question: https://gateoverflow.in/654
asked
11 hours
ago
in
Mathematical Logic
by
hadarsh
(
5
points)

7
views
discretemaths
0
votes
1
answer
What is total number of planer graph can be formed with 6 vertices ?
asked
5 days
ago
in
Graph Theory
by
subhadip997
(
9
points)

29
views
graphtheory
discretemaths
0
votes
1
answer
TestBook Test Series
Consider G(V, E) be a complete undirected graph with 6 edges having a distinct weight from 1, 3, 9, 27, 81, and 243. Which of the following will NOT be the weight of them minimum spanning tree of G? (*This question may have multiple correct answers) A)121 B)13 C)40 D)31
asked
Jan 1
in
Graph Theory
by
nisargdoshi
(
7
points)

35
views
discretemaths
0
votes
0
answers
Made easy 2018 postal study course
Why is the answer is d)? I guess it should be a) can someone explain please
asked
Dec 28, 2020
in
Mathematical Logic
by
Anshul purohit
(
5
points)

18
views
discretemaths
0
votes
0
answers
how to prove function injective or not
Let A, B, and C be finite sets, and f : B to C and g : A to B be functions. Let h be the function with domain A and range C that maps x in A to f (g(x)). Prove or disprove the following claim: If h is injective, then g must be injective.
asked
Dec 21, 2020
in
Set Theory & Algebra
by
tyagiabhi
(
5
points)

19
views
functions
discretemaths
0
votes
0
answers
#madeeasy #discretemaths
A group of 5 friends sitting on a bench. You have joined them with 8 sweets.All of you decided to share among ourself. The number of ways this distribution is possible is ___ i am getting ans 1287 but answer given is 20160 my approach is distribution of undistinguishable objects into distinguishable boxes. so formula is n+r1Cr here n =6,r=8 so ans is 13C8
asked
Dec 9, 2020
in
Combinatory
by
404 found
(
31
points)

12
views
discretemaths
0
votes
1
answer
#selfdoubt #discretemaths
can someone explains difference between equivalence classes and partitions. according to wiki Every element x of X is a member of the equivalence class [x]. Every two equivalence classes [x] and [y] are either equal or disjoint. ... below gate question https://gateoverflow.in/652/gate200025 they considers equivalence classes as partitions.Can someone explains why?
asked
Nov 30, 2020
in
Set Theory & Algebra
by
404 found
(
31
points)

18
views
discretemaths
0
votes
1
answer
#dicretemaths #madeeasy
Let G be a group.Suppose that the number of elements in G of order 5 is 28.Determine the number of distinct subgroups of G of order 5 __. Ans 7 .can someone explains how?
asked
Nov 28, 2020
in
Set Theory & Algebra
by
404 found
(
31
points)

15
views
discretemaths
0
votes
0
answers
#discretemaths #madeeasy
In a poset (A,<=) ,if there is no element ,x belongs to A with x<y then which of the following is true? An element x exists for which x=y. An element x is maximal in poset. A set with the same subset of poset An element x is ... correct bcz an element x is said to maximal if there exists no element y belongs to A such that xRy holds (x<y in this question).
asked
Nov 28, 2020
in
Set Theory & Algebra
by
404 found
(
31
points)

9
views
discretemaths
0
votes
0
answers
#discretemaths #madeeasy
For sets A and B ,let f:A?B and g:B?A be functions such that f(g(x))=x for each x.which of the following options is/are true? The function f must be one to one. The function f must be onto The function g must be one to one the function g must be onto ans is b,c. can someone explains how?
asked
Nov 28, 2020
in
Set Theory & Algebra
by
404 found
(
31
points)

10
views
discretemaths
0
votes
1
answer
Kenneth H Rosen
What is the meaning of all the four options? Please explain in detail.
asked
Nov 27, 2020
in
Mathematical Logic
by
Kindaichi
(
10
points)

30
views
kennethrosen
discretemaths
0
votes
0
answers
Could not found the source
A)T B) F C) T D) F E) T F) T G) F H) T Are these truth values that I assigned correct?
asked
Nov 21, 2020
in
Mathematical Logic
by
Marwajami
(
5
points)

22
views
discretemaths
0
votes
1
answer
Kenneth h rosen 7th Edition chapter 2 section 2.5 "cardinality of sets"
asked
Nov 21, 2020
in
Set Theory & Algebra
by
ykrishnay
(
7
points)

25
views
kennethrosen
discretemaths
combinatory
0
votes
0
answers
Kenneth h rosen 7th Edition chapter 2 section 2.4 "Sequences and Summation"
asked
Nov 20, 2020
in
Set Theory & Algebra
by
ykrishnay
(
7
points)

19
views
kennethrosen
discretemaths
combinatory
0
votes
0
answers
A site on google
Which of the following formulas represents the sentence, 'Share prices will go up, and if interest rates go up too, there will be a recession', where; p means 'share prices will go up' q means 'interest rates will go up' r means 'there will be a recession'. A) (p ∧ q) →r B) p∧( q →r)
asked
Nov 17, 2020
in
Mathematical Logic
by
Marwajami
(
5
points)

18
views
discretemaths
0
votes
1
answer
BS Gerewal engineering mathematics
hey guys, what is meant by the statement “cards are drawn in succession” . does it means whether one by one the cards were drawn OR all the cards were drawn at once any help is really appreciated….
asked
Oct 29, 2020
in
Probability
by
rish1602
(
9
points)

15
views
discretemaths
combinatory
counting
0
votes
0
answers
Gatebook function
How to solve this type of question ?
asked
Oct 2, 2020
in
Set Theory & Algebra
by
Raj_81
(
11
points)

23
views
discretemaths
functions
0
votes
1
answer
NPTEL DISCRETE STRUCTURE ASSIGNMENT QUESTION
Which of the following are logical consequences of { ($\alpha$ → $\beta$’), $\beta$, ($\gamma$ ’ → $\alpha$) } ($\alpha$ → $\beta$’) $\beta$’ $\gamma$ $\alpha$ Answer given is C but if this question asked as MSQ question then can A be the possible answer??
asked
Sep 19, 2020
in
Mathematical Logic
by
Akanksha Agrawal
(
309
points)

67
views
discretemaths
+1
vote
1
answer
Self doubt  Graph Connectivity (NPTEL & PY)
Let G be a graph with n vertices and if every vertex has a degree of at least $\frac{n−1}{2}$ then G is connected. Source : https://gateoverflow.in/1221/gate200723 Let G be a graph with n vertices and if every vertex has a degree of at ... then G is connected. source : https://nptel.ac.in/courses/106/106/106106183/ My doubt : Which one is right?
asked
Sep 17, 2020
in
Graph Theory
by
KUSHAGRA गुप्ता
(
1.4k
points)

50
views
discretemaths
graphtheory
0
votes
1
answer
Self Doubt  Planar graph (PY)
$K_5$ is nonplanar. I am showing you my proof. Please tell me whether this is the right way or not to prove that $K_5$ is nonplanar. $\sum$ (deg)$=4+4+4+4+4=20$ $e=10$ and $n=5$ Assume $K_5$ is planar. $ve+r=2$ ... $K_5$ is nonplanar. If this is the right way, why this method didn't work in this graph. Source: https://gateoverflow.in/87129/gate19903vi
asked
Sep 15, 2020
in
Graph Theory
by
KUSHAGRA गुप्ता
(
1.4k
points)

33
views
discretemaths
graphplanarity
graphtheory
selfdoubt
0
votes
2
answers
KENNETH ROSEN DISCRETE MATHEMATICS PAGE 432 Q11
How many ways are there to chose eight coins from piggy bank containing 100 identical pennies and 80 identical nickels.
asked
Sep 14, 2020
in
Combinatory
by
StoneHeart
(
735
points)

75
views
kennethrosen
combinatory
counting
discretemaths
+1
vote
1
answer
LATTICE ASSOCIATIVITY DOUBT
I wasn't convinced about the associativity property of lattices, and the proof i found on math.stackexchange seemed reasonable, but still i couldnt wrap my head around it. I tried to make a counter example, and in the above diagram (b join c) ... otherwise it would've satisfied associativity. But i cant seem to figure out why this diagram isn't a lattice. Please help.
asked
Aug 22, 2020
in
Set Theory & Algebra
by
rish18
(
9
points)

59
views
discretemaths
settheory&algebra
selfdoubt
0
votes
3
answers
Self Doubt in Propositional Logic
Translate this English proposition to Logical expression : “you will not get an A grade unless you work hard”
asked
Aug 21, 2020
in
Mathematical Logic
by
AbhayPrajapati
(
7
points)

36
views
propositionallogic
logic
discretemaths
0
votes
1
answer
ISI CSB 2018
State, with justification, which of the following expressions f, g and h, define valid realvalued functions over the set of positive rational numbers. We denote a rational number by m/n, where m and n are positive integers. (a) f(m/n) = 2^m − 2^n. (b) g(m/n) = log m − log n. (c) h(m/n) = (m^2 − n^2)/(mn).
asked
Aug 20, 2020
in
Set Theory & Algebra
by
suparna kar
(
9
points)

31
views
discretemaths
sets
+1
vote
1
answer
K Rosen(7th ed). Chapter 6. Exercise 6.4. Q.17.
Question: Answer 1: Answer 2: I am not able to understand the solution.What’s happening here? Please help.
asked
Aug 13, 2020
in
Combinatory
by
RasMalai
(
27
points)

30
views
kennethrosen
combinatory
counting
discretemaths
0
votes
2
answers
SelfDoubt 10 couple, { 10 men and 10 women }, Number of Ways
asked
Aug 12, 2020
in
Combinatory
by
mamtuj
(
25
points)

59
views
selfdoubt
discretemaths
permutation&combination
0
votes
1
answer
ISI CSB 2018
Given A = {1, 2, 3, .... , 70}, show that for any six elements a1, a2, a3, a4, a5 and a6 belonging to A, there exists one pair ai and aj for which ai − aj ≤ 14 (i not equals to j).
asked
Aug 11, 2020
in
Set Theory & Algebra
by
suparna kar
(
9
points)

29
views
discretemaths
0
votes
1
answer
Combinatorics and Probability
Six people, including A,B, and C, form a queue in a random order (all 6! orderings are equiprobable). Consider the event "B is between A and C in the queue". What is its probability? (The order of A and C can be arbitrary, but B should be between them).
asked
Aug 5, 2020
in
Probability
by
aryashah2k
(
2
points)

32
views
permutation&combination
conditionalprobability
discretemaths
probability
combinatory
0
votes
2
answers
Combinatorics and Probability
Six people including A,B, and C, form a queue in a random order (all 6! orderings are equiprobable). Consider the event "A precedes B in the queue". (Again this event does not mention C or other people in the queue. It happens when A is ... not require that B is the next after A, some people could be between A and B.) What is the probability of this event?
asked
Aug 5, 2020
in
Probability
by
aryashah2k
(
2
points)

237
views
conditionalprobability
permutation&combination
discretemaths
probability
0
votes
1
answer
Self Doubt : Lattice
$\left \{ 1,2,3,24,30 \right \}$ is it a lattice? I think this poset has no lub as $24$ and $30$ are not comparable. Am I right?
asked
Jul 20, 2020
in
Set Theory & Algebra
by
srestha
(
1k
points)

73
views
lattice
discretemaths
0
votes
1
answer
Relation :DiscreteMathGB
Let R be a relation from a set A to a set B. The inverse relation from B to A, denoted by , is the set of ordered pairs . S1: R is reflexive relation iff S2: R is a symmetric relation iff Which one of the following statements is true? (A).Only S1 (B).Only S2 (C).Both S1 and S2 (D).None
asked
Jul 10, 2020
in
Set Theory & Algebra
by
srestha
(
1k
points)

71
views
discretemaths
0
votes
0
answers
PROBABILTY AND DISTRIBUTIONS
A elevator manufacturing company believes that 'X' is the amount of that can elevator withstand without any damage with is mean 100 and standard deviation 10. This elevator is used to lift the company staff persons with mean 5 and standard deviation 0.5. How many staff person would have to be in the elevator for the probability of No damage exceeds to 0.85.
asked
Jun 30, 2020
in
Mathematical Logic
by
Stanfordboi
(
5
points)

14
views
discretemaths
probability
poissondistribution
binomialdistribution
0
votes
1
answer
Graph Theory with Applications to Engineering and Computer Science, Narsingh Deo, Chapter 4 Question 27
asked
Jun 23, 2020
in
Graph Theory
by
dararirum
(
5
points)

44
views
discretemaths
graphtheory
graphisomorphism
0
votes
1
answer
Graph Theory with Applications to Engineering and Computer Science, Narsingh Deo, Chapter 2 Question 21
asked
Jun 23, 2020
in
Others
by
dararirum
(
5
points)

44
views
discretemaths
graphtheory
0
votes
3
answers
Expectation : Self Doubt
There is a bag containing 5 white and 5 black balls. You repeat the following experiment till you see a white ball : take a ball uniformly at random out of the bag. If it is white, stop. Otherwise, put it back in the bag. What is the expected number of times you will need to draw a ball from the bag ?
asked
Jun 19, 2020
in
Probability
by
suparna kar
(
9
points)

154
views
discretemaths
expectation
0
votes
1
answer
Combinatorics Simple doubt
What is the difference between flipping a pair of Distinct dices and flipping a pair of Identical Dices ??
asked
Jun 18, 2020
in
Mathematical Logic
by
BHASHKAR
(
73
points)

24
views
discretemaths
permutation&combination
discretemaths
combinatory
0
votes
1
answer
Self doubt GRAPH THEORY
asked
May 31, 2020
in
Graph Theory
by
Abhipsa
(
5
points)

31
views
graphtheory
discretemathematics
discretemaths
discretemaths
0
votes
1
answer
self doubt permutation and combination
asked
May 31, 2020
in
Combinatory
by
Abhipsa
(
5
points)

19
views
discretemaths
combinatory
0
votes
1
answer
Self Doubt recurrence equation
asked
May 31, 2020
in
Combinatory
by
Abhipsa
(
5
points)

29
views
discretemaths
combinatory
0
votes
1
answer
P&C  self doubt
Find the number of arrangements of the letters of the word "INDEPENDENCE" if they start with "P" and end with "D"
asked
May 27, 2020
in
Combinatory
by
Abhipsa
(
5
points)

25
views
discretemathematics
combinatory
discretemaths
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