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Recent questions tagged permutationandcombination
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Arrangement Problem
The number of ways, we can arrange 5 books in 3 shelves ________. Given answer 2520 n=3 r=5 so answer is 31+5 P5= 7p5= 2520 My answer 3*3*3*3*3= 243 Where am I doing wrong? please help
asked
Jan 29
in
Combinatory
by
Mayank Bansal
(
75
points)

53
views
permutationandcombination
+1
vote
3
answers
2
MadeEasy Subject Test 2019: Combinatory  Permutations And Combinations
Q.The number of ways, we can arrange 5 books in 3 shelves ________.
asked
Jan 28
in
Combinatory
by
Badayayash
Junior
(
977
points)

420
views
discretemathematics
permutationandcombination
madeeasytestseries2019
madeeasytestseries
0
votes
0
answers
3
Permutation
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 ________. Please tell what are the extra cases in this: Choose 2 letters and put in box A – $^5C_2$ Now remaining 3 letters have $3^3$ choices So, $^5C_2 \times 3^3 = 270$
asked
Jan 27
in
Numerical Ability
by
shreyansh jain
Active
(
2.2k
points)

147
views
permutationandcombination
engineeringmathematics
discretemathematics
0
votes
2
answers
4
MadeEasy Full Length Test 2019: Combinatory  Permutations And Combinations
The number of ways 5 letter be put in 3 letter boxes A,B,C. If letter box A must contain at least 2 letters.
asked
Jan 22
in
Combinatory
by
snaily16
(
245
points)

207
views
discretemathematics
permutationandcombination
madeeasytestseries2019
madeeasytestseries
0
votes
1
answer
5
MadeEasy Test Series: Combinatory  Permutations And Combinations
why is my approach giving wrong answer: choose 2 men from 8: 8C2 choose 3 women from 5: 5C3 rest 8 people left ( 8+5 5= 8) , choose 1 from these 8 people = 8C1 Hence after multiplying above three we get 4480 but answer given is 700
asked
Jan 22
in
Mathematical Logic
by
bts1jimin
(
199
points)

38
views
discretemathematics
permutationandcombination
madeeasytestseries2019
madeeasytestseries
+1
vote
0
answers
6
Made Easy Test Series 2019: Combinatory  Permutations And Combinations
in how many ways 6 letters can be placed in 6 envelopes such that at least 4 letters go into their corresponding envelopes ?
asked
Jan 19
in
Combinatory
by
ronin_codex
(
11
points)

179
views
discretemathematics
permutationandcombination
madeeasytestseries2019
madeeasytestseries
0
votes
1
answer
7
generating function
asked
Jan 15
in
Combinatory
by
Rahul_Rathod_
(
425
points)

103
views
generatingfunctions
discretemathematics
permutationandcombination
#discrete
0
votes
1
answer
8
#combinatorics
How many ways the letters of the word “AABCCD” can be arranged such that, these neither begin with ‘A’ nor end with D ?
asked
Jan 15
in
Combinatory
by
Satbir
Boss
(
21.6k
points)

71
views
permutationandcombination
engineeringmathematics
0
votes
1
answer
9
RRB ALP
No. of ways to arrange the word letters “SEEDING” such that all vowel together Are? 340 360 720 780
asked
Jan 14
in
Numerical Ability
by
bhanu kumar 1
Junior
(
857
points)

86
views
permutationandcombination
and
0
votes
0
answers
10
Permutation and combination
In how many different ways can a set of 3n elements be partitioned into 3 subsets of equal number of elements? Isn't this case of distributing distinguishable objects and distinguishable boxes, so the answer should be $(3n)! / ((n!)^3 )$. But ... Can anybody explain? Or post a link where to study all concepts of permutation and combination and counting
asked
Jan 12
in
Mathematical Logic
by
bts1jimin
(
199
points)

70
views
permutationandcombination
engineeringmathematics
0
votes
1
answer
11
Permutation and Combination
The number of ways can 5 letters be put into 3 letter boxes A,B,C. If letter box A must contain atleast 2 letters ?
asked
Jan 12
in
Mathematical Logic
by
Na462
Loyal
(
6.9k
points)

202
views
permutationandcombination
discretemathematics
madeeasytestseries
0
votes
0
answers
12
Finding the coefficient
What is its answer ?
asked
Jan 9
in
Combinatory
by
Nandkishor3939
Active
(
1.3k
points)

28
views
engineeringmathematics
permutationandcombination
discretemathematics
0
votes
0
answers
13
No of subsequence
I understand that number of subsequences for a string of length n is 2^n when we don’t have any repetition. What is the number of “unique” subsequence when we have repetitions. As in the string : aabbbccddd
asked
Jan 8
in
Algorithms
by
shaz
(
369
points)

79
views
subsequence
algorithms
theoryofcomputation
permutationandcombination
0
votes
1
answer
14
MadeEasy Test Series: Numerical Abilty  Permutations and Combinations
Assume that there are 6 color letters L1,L2,L3,L4,L5,L6 are to be placed in 6 same color envelope E1,E2,E3,E4,E5,E6(one letter for each envelop). The number of possibilities to place exactly one letter in the correct envelop______. a)264 b)265 c)455 d)466
asked
Jan 7
in
Numerical Ability
by
Nandkishor3939
Active
(
1.3k
points)

110
views
madeeasytestseries
permutationandcombination
numericalability
0
votes
1
answer
15
Ace academy test series
Ans:C. Please explain
asked
Dec 28, 2018
in
Combinatory
by
amitqy
Active
(
1.8k
points)

136
views
settheory&algebra
permutationandcombination
testseries
0
votes
1
answer
16
NTA NET DEC 18 Q 94
asked
Dec 25, 2018
in
Combinatory
by
Sanjay Sharma
Boss
(
48.8k
points)

128
views
permutationandcombination
+7
votes
6
answers
17
TIFR2019B13
A row of $10$ houses has to be painted using the colours red, blue, and green so that each house is a single colour, and any house that is immediately to the right of a red or a blue house must be green. How many ways are there to paint the houses? $199$ $683$ $1365$ $3^{10}2^{10}$ $3^{10}$
asked
Dec 18, 2018
in
Combinatory
by
Arjun
Veteran
(
425k
points)

557
views
tifr2019
engineeringmathematics
discretemathematics
permutationandcombination
medium
0
votes
0
answers
18
Generating function(Find Coefficient of x^100)
How to find coefficient of $x^{100}$? $ = (1+x^{10}+(x^{10})^2 + \dots)(1+x^{20}+(x^{20})^2 + \dots)(1+x^{50}+(x^{50})^2 + \dots)\\ = (\frac{1}{1x^{10}}).(\frac{1}{1x^{20}}).(\frac{1}{1x^{50}}) $
asked
Dec 3, 2018
in
Combinatory
by
!KARAN
Active
(
2.2k
points)

165
views
generatingfunctions
discretemathematics
permutationandcombination
0
votes
1
answer
19
Counting MadeEasy
asked
Dec 2, 2018
in
Combinatory
by
garimanand
Active
(
1.6k
points)

73
views
permutationandcombination
0
votes
0
answers
20
Testbook Test Series: Combinatory  Permutations And Combinations
In how many ways we can wear 4 distinct rings in 3 particular fingers?
asked
Nov 30, 2018
in
Combinatory
by
shreyansh jain
Active
(
2.2k
points)

95
views
testbooktestseries
discretemathematics
permutationandcombination
+2
votes
1
answer
21
Graph Coloring
How many ways are there to color this graph from any $4$ of the following colors : Violet, Indigo, Blue, Green, Yellow, Orange and Red ? There is a condition that adjacent vertices should not be of the same color I am getting $1680$. Is it correct?
asked
Nov 27, 2018
in
Graph Theory
by
Balaji Jegan
Active
(
4.9k
points)

314
views
graphtheory
graphcoloring
permutationandcombination
+1
vote
0
answers
22
Ace test series
A medical student has to work in a hospital for five days in january.However,he is not allowed to work two consecutive days in the hospital.in how many different ways can he choose the five days he will work in the hospital? A)C(27,5) B)C(26,5) C)C(27,4) D)C(26,4)
asked
Nov 26, 2018
in
Combinatory
by
talha hashim
Loyal
(
5.5k
points)

74
views
permutationandcombination
0
votes
0
answers
23
Zeal Test Series 2019: Combinatory  Permutations And Combinations
in this type question i am finding difficulty to solve please tell me the approach with proper explanation
asked
Nov 18, 2018
in
Combinatory
by
Prince Sindhiya
Loyal
(
5.7k
points)

133
views
zeal
discretemathematics
permutationandcombination
zeal2019
0
votes
0
answers
24
Doubt
can someone explain the formula n^k when k distinguishable items are to be placed in n distinguishable boxes without any restrictions?
asked
Nov 16, 2018
in
Combinatory
by
aditi19
Active
(
5.1k
points)

28
views
permutationandcombination
engineeringmathematics
+2
votes
1
answer
25
Kenneth Rosen Edition 6th Exercise 5.6 Question 37 (Page No. 390)
How many solutions are there to the equation x1+x2+x3=17 with x1<6, x3>5?
asked
Nov 16, 2018
in
Combinatory
by
aditi19
Active
(
5.1k
points)

332
views
kennethrosen
discretemathematics
permutationandcombination
+1
vote
1
answer
26
ACE BOOK,
Number of nonnegative integer solutions to the equation $x_{1}+x_{2}+x_{3}+x_{4}=12,$ if each $x_i$ must have one of the values $1,2,3,4$ is_____
asked
Nov 16, 2018
in
Combinatory
by
Laxmi Yadav
(
79
points)

146
views
permutationandcombination
0
votes
1
answer
27
Kenneth Rosen Edition 6th Exercise 5.6 Question 25 (Page No. 389)
Suppose that a set S has n elements. How many ordered pairs(A,B) are there such that A and B are subsets of S with A$\subseteq$ B?
asked
Nov 14, 2018
in
Combinatory
by
aditi19
Active
(
5.1k
points)

62
views
kennethrosen
discretemathematics
permutationandcombination
+1
vote
1
answer
28
How to find total no of integer solutions to the below equation ?
In X+y+z<=12 , X,y,z>=1 How to find total no of integral solutions ?If you are introducing any dummy variable for solving , please do explain the logic behind this .
asked
Nov 11, 2018
in
Combinatory
by
radha gogia
Loyal
(
6.3k
points)

301
views
permutationandcombination
0
votes
0
answers
29
Discrete Maths
The nonnegative integral solutions to the equation $x_1+x_2+x_3+x_4 \leq10$ I got 209 as answer.Is it correct?
asked
Nov 6, 2018
in
Combinatory
by
Ayush Upadhyaya
Boss
(
27.7k
points)

71
views
discretemathematics
permutationandcombination
0
votes
1
answer
30
Number of substrings for a given sub string having repeated symbols
Lets for a a given string aabbbccdd I need to find the number of substrings possible how to go about it? Does the n(n+1)/2 formula work here also?
asked
Nov 5, 2018
in
Theory of Computation
by
sripo
Active
(
2.4k
points)

172
views
permutationandcombination
counting
theoryofcomputation
algorithms
finiteautomata
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