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Recent questions and answers in Combinatory
0
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0
answers
#discrete mathematics #exponential generating function
asked
3 days
ago
in
Combinatory
by
souren
(
28
points)

4
views
discretemaths
kennethrosen
0
votes
0
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
asked
Feb 16
in
Combinatory
by
Mitali gupta
(
6
points)

23
views
discrete_maths
#combinatory
0
votes
0
answers
Self Doubt combinatorics
Let X denote the number of ways of distributing 7 identical balls to 3 children such that each child gets at least one ball. Then the value of X is equal to _________. what should I be using here.. ($_{r}^{n1+r}\textrm{}$) or
asked
Feb 7
in
Combinatory
by
kalra05
(
73
points)

43
views
discrete_maths
0
votes
0
answers
Combinatorics Self Doubt
https://gateoverflow.in/48924/combinationswithrepetitions Somebody, please explain all the cases asked in the above question.
asked
Feb 6
in
Combinatory
by
kashyap02
(
26
points)

27
views
#permutationandcombination
#discrete_maths
#combinatory
0
votes
0
answers
MADE EASY: COMBINATORICS
The number of ways can $5$ letter be put in $3$ boxes $A$,$B$,$C$, such that $A$ contains atleast $2$ letters is __________ ?
asked
Jan 30
in
Combinatory
by
Debapaul
(
699
points)

49
views
madeeasytestseries
0
votes
0
answers
Testbook FLT
I’m getting 41. Can someone please confirm?
asked
Jan 29
in
Combinatory
by
Sambhrant Maurya
(
401
points)

49
views
testbooktestseries
combinatory
graphtheory
0
votes
0
answers
generating function self doubt
given the generating function as (X^6 1 )/(X1) find the sequence?
asked
Jan 27
in
Combinatory
by
eyeamgj
(
41
points)

53
views
0
votes
0
answers
ace academy test series mock test
38.
asked
Jan 23
in
Combinatory
by
Rahul Burman
(
21
points)

27
views
aceacademytestseries
engineeringmathematics
0
votes
2
answers
MADE EASY CBT2
The number of nine digits numbers which can be formed using this digits 0,0,0,1,1,1,2,2,2 such that no two pairs of same type of digits are together? ( eg. 00 or 11 can not be together).
answered
Jan 22
in
Combinatory
by
pranay562
(
926
points)

45
views
madeeasycbt
+1
vote
0
answers
Collinear points on a plane
Suppose 10 points are drawn on a plane such that exactly 4 of the points are collinear and among the remaining points no three points are collinear. How many distinct lines can be drawn by connecting any two among these 10 points?
asked
Jan 20
in
Combinatory
by
Akash Papnai
(
17
points)

25
views
discrete_maths
permutationandcombination
0
votes
1
answer
GATE MOCK TEST 3 GATE 2019 Q60 Combinatorics
I tried like this: Required probability= ways to put 3balls in box 1 / total ways to put 12 balls in 3 box = number of solutions to x1+x2=9 / number of solutions to x1+x2+x3=12 Will it not worth with star and bar method?
answered
Jan 18
in
Combinatory
by
neeraj_bhatt
(
275
points)

25
views
0
votes
0
answers
Made Easy CBT1
1) The Number of Solution set(x,y) for the equation 4x+7y=3, such that 99<=x<=99 and 100<=y<=100, where x,y belongs to Integers. 14 b. 29 c. 15 d. 30
asked
Jan 18
in
Combinatory
by
Dheeraj Varma
(
22
points)

23
views
madeeasycbt
0
votes
0
answers
MADE EASY FULL TEST 7 advance level
the number of even palindromes over the alphabet {p,q,r} upto length n equals 121? what is n? I calculated for 0,2,4,6,8 and individual comes out to be 1,3,9,18,69 and it adds upto 100, so how answer can be 8?(they have given 8 as answer) what is the mistake?
asked
Jan 18
in
Combinatory
by
Rajat Maheshwari
(
14
points)

25
views
0
votes
1
answer
Ace full length : Discrete Maths
answered
Jan 10
in
Combinatory
by
Pratyush Priyam Kuan
(
804
points)

36
views
aceacademytestseries
engineeringmathematics
permutationandcombination
0
votes
0
answers
Made easy test series: Combinatorics
The number of ways can 5 letter be put into 3 letter boxes A, B, C if letter box A must contain atleast 2 letters ________. Can anyone give good explaination with answer for above question.
asked
Dec 31, 2019
in
Combinatory
by
vishal burnwal
(
135
points)

20
views
madeeasytestseries
0
votes
0
answers
MadeEasy Demo Test Q30
asked
Dec 30, 2019
in
Combinatory
by
ssap09
(
42
points)

6
views
madeeasytestseries
#gatepreparation
discrete_maths
permutation&combination
0
votes
0
answers
Made Easy FULL LENGTH1
The number of 3 letter words possible for the word “ESSEL” is equal to __________
asked
Dec 30, 2019
in
Combinatory
by
Dipanshu Rana
(
34
points)

29
views
0
votes
1
answer
Ace academy volume 1, page number 73, question number 68.
answered
Dec 24, 2019
in
Combinatory
by
neeraj_bhatt
(
275
points)

30
views
0
votes
1
answer
ACE full length mock test
Eight people enter an elevator at the first floor. The elevator discharges passengers on each successive floor until it empties on the fifth floor. Number of different ways this can happen______? Answer given 40824
answered
Dec 19, 2019
in
Combinatory
by
Mk Utkarsh
(
505
points)

37
views
0
votes
0
answers
#combinotrics
Q.the number of way six distinct balls be distributed into 3 distinct urns.If each urn contain at least one ball are....
asked
Dec 7, 2019
in
Combinatory
by
amit166
(
139
points)

8
views
permutationandcombination
0
votes
0
answers
Made Easy Test Series : Combinatory
Doubt: I eliminated half of the possibility from $\binom{24}{2}$ to remove t₁>t₂ and got the answer as 2070. Somebody, please explain why I am wrong and the solution is correct.
[closed]
asked
Dec 6, 2019
in
Combinatory
by
Rudr Pawan
(
734
points)

9
views
0
votes
0
answers
Self doubt on counting
1.Number of Distributions of 5 books in 3 bookshelves such that each bookshelf get atleast 1 book 2.Number of Arrangement of 5 books in 3 bookshelves such that each bookshelf get atleast 1 book. I’m unable to understand the difference between Arrangements & Distributions. Can someone explain ?
asked
Dec 5, 2019
in
Combinatory
by
pranay562
(
926
points)

10
views
counting
discrete_maths
0
votes
0
answers
self doubtpermutation and combination
Given 100 boys and 80 girls,how many possible arrangements are possible such that atmost 2 girls sit together?
asked
Dec 3, 2019
in
Combinatory
by
Doraemon
(
101
points)

22
views
0
votes
0
answers
ACE Material
Donuts come in 30 different varieties and Catherine wants to buy a dozen . How many choices does she have? Explain this please.
asked
Dec 2, 2019
in
Combinatory
by
teja1521
(
8
points)

6
views
#combinatory
#discrete_maths
+1
vote
0
answers
Applied course test series: Combinatorics
How to solve above type of questions? Is there any good tricks to solve above type questions.
asked
Dec 1, 2019
in
Combinatory
by
vishal burnwal
(
135
points)

22
views
permutationandcombination
0
votes
1
answer
Mathematics Venn diagram
Of 30 Personal Computers owned by faculty members in a certain university department,20 run windows,eight have 21 inch monitors,25 have CDROM drives.20 have atleast two of these features and 6 have all the three features. How many PC’s have atleast one of these features? How many have none of these features? How many have exactly one feature? Anyone please clarify.
answered
Nov 23, 2019
in
Combinatory
by
Satbir
(
4.1k
points)

40
views
discrete_maths
engineeringmaths
+1
vote
0
answers
No of binary trees with n labelled nodes
So I followed this link and have doubt regarding the no of ways of choosing edges with $n$ labelled nodes. Let's say I have 3 nodes  $A, B, C$ $l_X$ : left child of a node $X$ $r_X$ : right child of a node $X$ Now, any ... be considered that both $(l_A,r_A)$ and $(r_A,l_A)$ produces 1 unique binary trees each. Is this the correct way to think about this?
asked
Nov 21, 2019
in
Combinatory
by
avistein
(
355
points)

18
views
binarytree
permutationandcombination
0
votes
1
answer
GENERATING FUNCTION: Kenneth Rosen
Find the generating function of the sequence 2, 4, 10, 28, 82, ……
answered
Nov 18, 2019
in
Combinatory
by
GAITONDE
(
1.7k
points)

17
views
kennethrosen
0
votes
1
answer
MADE EASY TEST : DISCRETE MATHS
In how many ways 11 chocolates can be distributed to 7 children such that each one gets atleast one is ____
answered
Oct 21, 2019
in
Combinatory
by
GAITONDE
(
1.7k
points)

17
views
madeeasytestseries
0
votes
0
answers
Self Doubt : Integer Solution
Find the number of ways 5 dices can be rolled to get a sum of 25. While solving this question, the way we solve it is $x_1+x_2+x_3+x_4+x_5$ $=25$ where $1<=x_i<=6$ So we replace $x_i$ by $y_i =6x_i$ , which is $x_i=6y_i$ substituting ... first problem all the dices should have value $>0$ , so why in that case we haven't made $x_i=y_i+1$ for all the cases?
asked
Oct 19, 2019
in
Combinatory
by
Debapaul
(
699
points)

43
views
integer
solutions
permutationandcombination
0
votes
0
answers
nptel assignment
I am getting answer 64 didn’t know how answer is 40
asked
Oct 17, 2019
in
Combinatory
by
Akanksha Agrawal
(
6
points)

24
views
0
votes
0
answers
Self Doubt: Number of integer solutions
asked
Oct 5, 2019
in
Combinatory
by
Debapaul
(
699
points)

12
views
permutationandcombination
0
votes
0
answers
madeeasy class notes(generating function)
get the generating function for x(1+x)(1x)^3 .
asked
Sep 20, 2019
in
Combinatory
by
eyeamgj
(
41
points)

10
views
0
votes
1
answer
Problem on Probability
A set contain 5 distinct element .A oneone mapping is selected at random from A to A.Find the probability that number match to exactly itself.
answered
Sep 15, 2019
in
Combinatory
by
GAITONDE
(
1.7k
points)

21
views
probability
0
votes
2
answers
Self doubt on permutations in.combinatorics
Let 7 digit no is to be made then find total no of ways If the no is divisible by 3 and repetition is allowed and zero is not used
answered
Sep 1, 2019
in
Combinatory
by
Bikram
(
1.2k
points)

28
views
permutationandcombination
0
votes
1
answer
Binary String with 5 0's and 6 1's possible, where all 0's are together.
answered
Aug 24, 2019
in
Combinatory
by
Satbir
(
4.1k
points)

32
views
discrete_maths
permutationandcombination
0
votes
0
answers
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
asked
Aug 13, 2019
in
Combinatory
by
Shubhm
(
23
points)

12
views
permutationandcombination
0
votes
1
answer
Self Doubt: Combinatorics
In how many ways a garland maker can stitch the flowers to make a garland with 4 red roses(distinct) and 10 white roses(distinct) so that no 2 red roses come together. My doubt is should we take (n1)!/2 * 10P4 or (n1)! * 10P4? As it is a case of nonliving object y should we make distinction between clockwise and anticlockwise? (n1)!/2 is more apt right?
answered
Aug 10, 2019
in
Combinatory
by
Satbir
(
4.1k
points)

65
views
permutationandcombination
circular_arrangement
0
votes
0
answers
Combinatorics
What is the logic to solve this?
asked
Aug 9, 2019
in
Combinatory
by
Jean
(
8
points)

19
views
permutationandcombination
#gate
0
votes
1
answer
A person shops for 10 chocolates of 3 different types. How many selections of chocolates can he make?
answered
Aug 8, 2019
in
Combinatory
by
Satbir
(
4.1k
points)

76
views
permutation&combination
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