Recent questions in Combinatory

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1

Kenneth Rosen chapter 5 20 discrete mathematics
A playoff between two teams consists of at most five games . The first team that wins three games wins the playoff. In how many different way playoff occur? [closed]

asked 3 days ago in Combinatory by Ram Swaroop Active (2.2k points) | 21 views

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1 answer

2

Self Doubt
From a group of 5 woman and 7 man we have to select a committee consisting of 2 woman and 3 men. Find the total number of ways to select such committed if (1 and 2 are a separate question) 1. Four man refuse to be in the same committee 2. 2 woman refuse to be in the same committee.

asked Feb 8 in Combinatory by smsubham Loyal (9.1k points) | 49 views

+1 vote

1 answer

3

GATE2019-5
Let $U = \{1, 2, \dots , n\}$ Let $A=\{(x, X) \mid x \in X, X \subseteq U \}$. Consider the following two statements on $\mid A \mid$. $\mid A \mid = n2^{n-1}$ $\mid A \mid = \Sigma_{k=1}^n k \begin{pmatrix} n \\ k \end{pmatrix}$ Which of the above statements is/are TRUE? Only I Only II Both I and II Neither I nor II

asked Feb 7 in Combinatory by Arjun Veteran (384k points) | 1.9k views

+1 vote

1 answer

4

Letters in boxes - combinations
Q .) The number of ways can 5 letter be put in 3 boxes A, B,C such that A has at least 2 letters. My approach: Number of ways to choose 2 letters out of 5 is 5C2. And for each such combination the remaining 3 letter have 3 choice. Therefore 5C2 * 3^3, but this is incorrect. Please point out the fault in my understanding and also the correct way to solve it

asked Jan 31 in Combinatory by shaz (347 points) | 40 views

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0 answers

5

Arrangement
Number of ways we can arrange 5 books in 3 selves___________ [closed]

asked Jan 31 in Combinatory by srestha Veteran (108k points) | 72 views

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6

test series question
the no. of ways we can arrange 5 books in 3 shelves? [closed]

asked Jan 30 in Combinatory by Ashwani Yadav Active (1.1k points) | 56 views

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7

The number of ways in which we can place 3 white pawns and 3 black pawns on a 3 . 3 Chessboard is equal to [closed]

asked Jan 30 in Combinatory by mehul vaidya Active (3k points) | 23 views

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0 answers

8

Arrangement Problem
The number of ways, we can arrange 5 books in 3 shelves ________. Given answer 2520 n=3 r=5 so answer is 3-1+5 P5= 7p5= 2520 My answer 3*3*3*3*3= 243 Where am I doing wrong? please help [closed]

asked Jan 29 in Combinatory by Mayank Bansal (73 points) | 40 views

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2 answers

9

MadeEasy Test Series
What is the number of seven digit integers possible with sum of the digits equal to 11 and formed by using the digits 1, 2 and 3 only?

asked Jan 29 in Combinatory by mehul vaidya Active (3k points) | 78 views

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1 answer

10

Ace pregate
Let S={a,b,c,d,e}. Number of strings of length 5 possible with the letters of S , so that atleast two A's are consecutive is? Answer given is : 421

asked Jan 27 in Combinatory by Vignaneswarkrishna (167 points) | 37 views

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11

#Combinatorics

asked Jan 24 in Combinatory by vipul2097 (43 points) | 69 views

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0 answers

12

ace test series question on number of palindromes

asked Jan 24 in Combinatory by Shankar Kakde (369 points) | 26 views

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0 answers

13

ME ADVANCE TEST
The number of ways in which we can place 3 white pawns and 3 black pawns on a 3 × 3 Chessboard is equal to

asked Jan 23 in Combinatory by himgta Active (3.6k points) | 50 views

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0 answers

14

made easy test
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 (255 points) | 120 views

+1 vote

0 answers

15

Made easy test series
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 (19 points) | 129 views

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1 answer

16

nptel
Q.1 In a country there are coins of denominations $2, $3, $5 and $7. How many different ways are there to pay exactly $10? approach??

asked Jan 19 in Combinatory by BASANT KUMAR Active (2.4k points) | 25 views

+1 vote

0 answers

17

made easy adv mock
the number of ways in which we can place 3 white pawns and 3 black pawns on a 3*3 chessboard my answer was 12. approach :- we cant have any 2 black pawns or 2 white pawns in the same row or column {3*2*1} * {2*1 * 1} am i correct??

asked Jan 18 in Combinatory by Gate Fever Active (4.7k points) | 90 views

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0 answers

18

************ Test series
Consider the graph G whose vertices are 4 element subsets of the set {1, 2, 3…10} with two vertices adjacent if and only if their intersection is empty. Then the number of edges does G have

asked Jan 17 in Combinatory by M.G (445 points) | 32 views

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0 answers

19

Test series
In how many ways 20 two rupees coins can be distributed among 4 children? Answer – 1771

asked Jan 16 in Combinatory by sahil_malik (373 points) | 64 views

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0 answers

20

How to solve this question
If seven colors are used to paint 50 bicycles then which of the following statements need not be true? at least eight bicycles are of the same color at least seven bicycles are of the same color at least nine bicycles are of the same color at most eight bicycles are of the same color

asked Jan 16 in Combinatory by `JEET Active (3.3k points) | 51 views

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1 answer

21

How to solve such question
The number of ways can 10 balls be chosen from an urn containing 10 identical green balls, 5 identical yellow balls and 3 identical blue balls are _______________.

asked Jan 16 in Combinatory by `JEET Active (3.3k points) | 19 views

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1 answer

22

generating function

asked Jan 15 in Combinatory by Rahul_Rathod_ Junior (565 points) | 72 views

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1 answer

23

#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 Active (4.9k points) | 62 views

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0 answers

24

MADE EASY TEST SERIES
Let We define Then ar is equal to. $\binom{r}{2019}$ $\binom{r}{r + 2018}$ $\binom{r}{2019 – r}$ $\binom{r}{r – 2018}$ Can anyone tell me if this type of question is in Gate 2019 syllabus or not because I have never seen such question in previous year question? If yes, then when can I learn this stuff from. Because I am unable to understand the whole solution.

asked Jan 13 in Combinatory by jhaanuj2108 (215 points) | 35 views

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0 answers

25

made easy
let an be the recurrenence relation which satisfies $a_{n}=4(a_{n-1}-a_{n-2})$ with $a_{1}$=2 and $a_{2}=8$. let X corresponds to the value of $a_{17}$.then values of $log_{2}(\left | x \right |)$ will be _____? am getting 18. [closed]

asked Jan 11 in Combinatory by Gate Fever Active (4.7k points) | 55 views

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0 answers

26

APPLIED-COURSE-MOCKTEST-2
How many 5 digit numbers can be formed if either (a) every successive digit exceeds its predecessor ,or (b) every successive digit is smaller than it’s predecessor Note:leading 0’s don’t count ,like 04521 is not a 5-digit number._

asked Jan 9 in Combinatory by Prateek Raghuvanshi Loyal (9.6k points) | 51 views

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0 answers

27

APPLIED-COURSE-mocktest-2
for whole number n, consider the following recurrence relation defined as $a_{n+2}=(n+3)a_{n+1}-(n+2)a_n$ and $a_1=1,a_2=3$ find $( \sum_{k=1}^{2015}a_k)(mod\; 100)$ is _

asked Jan 9 in Combinatory by Prateek Raghuvanshi Loyal (9.6k points) | 38 views

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0 answers

28

Finding the coefficient
What is its answer ?

asked Jan 9 in Combinatory by Nandkishor3939 Active (1.2k points) | 20 views

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0 answers

29

ACE ACADEMY

asked Jan 6 in Combinatory by Sinchit (39 points) | 24 views

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1 answer

30

[MEasy Test Discrete]
The number of seven digit integers possible with sum of the digits equal to 11 and formed by using the digits 1, 2 and 3 only are ________.

asked Jan 5 in Combinatory by VikramRB (205 points) | 52 views

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author	user:martin
title	title:apple
content	content:apple
exclude	-tag:apple
force match	+apple
views	views:100
score	score:10
answers	answers:2
is accepted	isaccepted:true
is closed	isclosed:true

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