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Recent questions and answers in Combinatory
0
votes
1
answer
TIFRGS2021 Question
A box contains 5 red marbles, 8 green marbles, 11 blue marbles, and 15 yellow marbles. We draw marbles uniformly at random without replacement from the box. What is the minimum number of marbles to be drawn to ensure that out of the marbles drawn, at least 7 are of the same colour? (A) 7 (B) 8 (C) 23 (D) 24 (E) 39
answered
Mar 24
in
Combinatory
by
zxy123
(
3.6k
points)

10
views
tifr2021
0
votes
0
answers
TIFRGS2021 Question
Let $d$ be the number of positive square integers (that is, it is a square of some integer) that are factors of $20^5\times21^5$. Which of the following is true about $d$? (A) $50 \leq d < 100$ (B) $100 \leq d < 150$ (C) $150 \leq d < 200$ (D) $200 \leq d < 300$ (E) $300 \leq d$
asked
Mar 24
in
Combinatory
by
zxy123
(
3.6k
points)

5
views
tifr2021
factors
0
votes
0
answers
TIFRGS2021 Question
Let $n$, $m$ and $k$ be three positive integers such that $n \geq m \geq k$. Let $S$ be a subset of $\{1, 2, , n\}$ of size $k$. Consider sampling a function uniformly at random from the set of all functions mapping $\{1, , n\}$ to $\{1, , m\}$. What is the probability ... $1  \frac{k!{n\choose k}}{n^k}$ (E) $1  \frac{k!{n\choose k}}{m^k}$
asked
Mar 24
in
Combinatory
by
zxy123
(
3.6k
points)

4
views
tifr2021
binomial
0
votes
0
answers
NPTEL Assignment
In how many ways can one arrange five 1’s and five 1’s so that all ten partial sums (starting with the first summand) are nonnegative?
asked
Feb 6
in
Combinatory
by
Kindaichi
(
10
points)

23
views
discretemaths
0
votes
0
answers
Kenneth H rosen Chapter 6  "Counting" Section 6.4
asked
Jan 20
in
Combinatory
by
ykrishnay
(
7
points)

17
views
kennethrosen
discretemaths
combinatory
counting
+1
vote
1
answer
Gate Applied Course Test Series
There are 20 intermediate stops on a route of a transport corporation bus. The number of ways in which the bus can stop at 6 of these intermediate stops such that no 2 stops are consecutive is ?
answered
Jan 12
in
Combinatory
by
zxy123
(
3.6k
points)

33
views
combinatory
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
(
37
points)

13
views
discretemaths
+1
vote
1
answer
Self Doubt. Combinatorics. How do I solve this question
answered
Nov 11, 2020
in
Combinatory
by
SarathBaswa
(
849
points)

50
views
combinatory
+1
vote
0
answers
Self Doubt in distribution problem
I have a small doubt which is : Is identical to identical distribution the same as integer partition? Or in general, how to deal with distribution of identical letters to identical boxes?
asked
Nov 9, 2020
in
Combinatory
by
s_dr_13
(
15
points)

16
views
selfdoubt
gatesyllabus
+1
vote
2
answers
Made easy  Discrete mathematics
How many ways can 10 balls be chosen from a container having 10 identical green balls , 5 identical yellow balls and 3 identical blue balls
answered
Oct 30, 2020
in
Combinatory
by
ijnuhb
(
747
points)

112
views
discretemaths
combinatory
0
votes
0
answers
online search
there are 5 pairs of different shoes.in how many ways can each person so that at least two person get a complete pair
asked
Oct 20, 2020
in
Combinatory
by
ajay05908
(
5
points)

14
views
combinatory
0
votes
1
answer
Rosen  combinatorics ex 5.5 que 4
Every day a student randomly chooses a sandwich for lunch from a pile of wrapped sandwiches. If there are six kinds of sandwiches how many diff ways are there for the student to choose sandwiches for the 7 days of a week if the order in which sandwiches are chosen matters
answered
Oct 17, 2020
in
Combinatory
by
mayureshpatle
(
861
points)

27
views
combinatory
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.
answered
Oct 9, 2020
in
Combinatory
by
Nikhil_dhama
(
151
points)

93
views
kennethrosen
combinatory
counting
discretemaths
0
votes
1
answer
Applied scholarship test
The number of straight lines that can be drawn through 90 points.Given that 10 of them lie on a straight line.
answered
Sep 28, 2020
in
Combinatory
by
himanshu2021
(
133
points)

39
views
0
votes
1
answer
Applied Scholarship Test
A)1/16 B)1/15 C)1/4 D)NONE
answered
Sep 28, 2020
in
Combinatory
by
himanshu2021
(
133
points)

30
views
0
votes
1
answer
Test Question of Applied Gate
Not able to solve this question. How to solve this type of questions?
answered
Sep 16, 2020
in
Combinatory
by
Ehraz Hasan
(
366
points)

42
views
combinatory
0
votes
3
answers
RosenChapter 8, Ex 8.5,Question 24
Find the probability that when a fair coin is flipped five times tails comes up exactly three times, the first and last flips come up tails, or the second and fourth flips come up heads.
answered
Sep 16, 2020
in
Combinatory
by
ijnuhb
(
747
points)

121
views
kennethrosen
discretemathematics
0
votes
0
answers
Self doubt on Permutations and combination
If no three diagonals of a convex decagon meet at the same point inside the decagon, into how many line segments are the diagonals divided by their intersection?
asked
Sep 9, 2020
in
Combinatory
by
ijnuhb
(
747
points)

31
views
0
votes
0
answers
Self Doubt on Combinatorics
Why these 2 questions solved in different manner while it seems like both are same type questions?? Anyone Please.
asked
Sep 4, 2020
in
Combinatory
by
AbhayPrajapati
(
7
points)

25
views
combinatory
selfdoubt
maths
combinatory
0
votes
0
answers
self doubt o this question
How can you get like for 2 I’s (3!*4)/2! ?? I know i am asking such a basic question but i’m little bit confused that’s why i asking.
asked
Sep 4, 2020
in
Combinatory
by
AbhayPrajapati
(
7
points)

21
views
0
votes
1
answer
Self Doubt on Combinatorics
Is there any difference between these 2 questions?? If yes then how can we solve this???
answered
Sep 3, 2020
in
Combinatory
by
ijnuhb
(
747
points)

62
views
maths
selfdoubt
combinatory
0
votes
2
answers
Allan Career Institute: Discrete Math
Let $f\left ( x\right )$ be continuous probability density function of a random variable $X.$ Then probability of $a\leq X< b$ is $A)f\left ( b \right )f\left ( a \right )$ $B)f\left ( ab \right )$ $C)\int_{b}^{a}xf\left ( x \right )dx$ $D)\int_{b}^{a}f\left ( x \right )dx$ Plz give some link for probability of pdf
answered
Aug 16, 2020
in
Combinatory
by
jayeshasawa001
(
2.5k
points)

76
views
discretemaths
0
votes
1
answer
Self Doubt recurrence equation
answered
Aug 16, 2020
in
Combinatory
by
Arkaprava
(
801
points)

31
views
discretemaths
combinatory
+1
vote
1
answer
Kenneth Rosen(7th ed). Chapter 6. Example 16.
Each user on a computer system has a password, which is six to eight characters long, where each character is an uppercase letter or a digit. Each password must contain at least one digit. How many possible passwords are there? Answer is given in book as : P^6 + P ... on for P^7 and P8. My question is why can't we calculate P^6 like 36^5 * C(6,1) * 10 ?
answered
Aug 15, 2020
in
Combinatory
by
Arkaprava
(
801
points)

25
views
combinatory
counting
kennethrosen
0
votes
3
answers
Self Doubt. Combination, Circular. A, B, C, D, E, f are on circlular table.
answered
Aug 14, 2020
in
Combinatory
by
jayeshasawa001
(
2.5k
points)

56
views
combinatory
selfdoubt
0
votes
2
answers
SelfDoubt 10 couple, { 10 men and 10 women }, Number of Ways
answered
Aug 14, 2020
in
Combinatory
by
jayeshasawa001
(
2.5k
points)

59
views
selfdoubt
discretemaths
permutation&combination
+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.
answered
Aug 13, 2020
in
Combinatory
by
Arkaprava
(
801
points)

31
views
kennethrosen
combinatory
counting
discretemaths
+1
vote
1
answer
nptel assignment
I am getting answer 64 didn’t know how answer is 40
answered
Aug 12, 2020
in
Combinatory
by
Arkaprava
(
801
points)

85
views
0
votes
1
answer
#discrete mathematics #exponential generating function
answered
Aug 12, 2020
in
Combinatory
by
Arkaprava
(
801
points)

19
views
discretemaths
kennethrosen
0
votes
1
answer
jee practice ques permutation
There are 5 apples 10 mangoes and 15 oranges in a basket. Then find number of ways of distributing 15 fruits each to 2 persons. a)56 b)64 c)66 d)72
answered
Aug 11, 2020
in
Combinatory
by
Arkaprava
(
801
points)

39
views
combinatory
0
votes
1
answer
Made easy topic wise tests
please explain this briefly!! .
answered
Aug 11, 2020
in
Combinatory
by
jayeshasawa001
(
2.5k
points)

37
views
+1
vote
1
answer
Explain this briefly
2^n 2^n1 (2^n1)1 n^2
answered
Aug 10, 2020
in
Combinatory
by
jayeshasawa001
(
2.5k
points)

53
views
0
votes
0
answers
Recurrence relation  ROSEN
$1.\ a_{k}=3a_{k1}+4^{k1} a_{0}=1$ $2.\ a_{k}=4a_{k1}4_{k2}+k^2 a_{0}=2,a_{1}=5$
asked
Aug 6, 2020
in
Combinatory
by
KUSHAGRA गुप्ता
(
1.4k
points)

69
views
recurrencerelations
kennethrosen
discretemathematics
0
votes
0
answers
Self doubt on combinatorics
How many strings are there, using 10 A's, 12 B's, 11 C's, and 15 D's, such that no A is followed by a B, and no C is followed by a D?
asked
Jul 29, 2020
in
Combinatory
by
RasMalai
(
27
points)

16
views
combinatory
permutation&combination
combinatory
0
votes
0
answers
Sheldon Ross (8th ed). Chapter 1. Self test problems. Q 4.
asked
Jul 29, 2020
in
Combinatory
by
RasMalai
(
27
points)

36
views
combinatory
0
votes
0
answers
Sheldon Ross(8th ed). Chapter 1. Theoretical Excercises. Q 11.
asked
Jul 27, 2020
in
Combinatory
by
RasMalai
(
27
points)

41
views
combinatory
0
votes
1
answer
self doubt permutation and combination
answered
Jun 1, 2020
in
Combinatory
by
vps123
(
9
points)

22
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"
answered
May 29, 2020
in
Combinatory
by
Mohit Kumar 6
(
5
points)

33
views
discretemathematics
combinatory
discretemaths
0
votes
0
answers
ISI Tomato Book
The value of $\sum \binom{k}{i} \binom{Mk}{100i} [(ki)/(M100)]/ \binom{M}{100}$, where M – k > 100, k > 100 and $\binom{m}{n}$= m!/{(m – n)!n!} equals (summation running from i = 0 to i = 100) (a) k/M (b) M/k (c)$k/M^{2}$ (d) $M/k^{2}$
asked
May 13, 2020
in
Combinatory
by
PSDesai09
(
5
points)

22
views
combinatory
combinatory
discretemaths
0
votes
0
answers
GATE201846 Video Solution
The number of possible minheaps containing each value from $\{1,2,3,4,5,6,7\}$ exactly once is _______
asked
Apr 18, 2020
in
Combinatory
by
admin
(
573
points)

15
views
gate2018
combinatory
numericalanswers
videosolution
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