Recent questions in Combinatory

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1

PERMUTATIONS

asked 3 days ago in Combinatory by Parshu gate (381 points) | 27 views

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1 answer

2

doubt
Suppose that we draw a card from a deck of 52 cards and replace it before the next draw. In how many ways can 10 cards be drawn so that the tenth card is a repetition of a previous draw.

asked 4 days ago in Combinatory by Divyanshu Tiwari (15 points) | 9 views

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1 answer

3

combinatorics
10 persons are seated at round table. The number of ways of selecting 3 persons out of them if no two persons are adjacent to each other is?

asked 5 days ago in Combinatory by Kaluti Active (2.3k points) | 18 views

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1 answer

4

P& c doubt
In a room filled with 7 people ,4 people have exactly 1 Sibling in the room and three people have exactly two sibling in the room .if two individuals are selected from the room at random what is the probability that those two individuals are not sibling? 5/21 3/7 4/7 5/7 16/21

asked Sep 14 in Combinatory by Surya Dhanraj Active (1.8k points) | 26 views

+1 vote

1 answer

5

P & C doubt
Vijay wrote 4 different letter to send to 4 different addresses .for each letter, he prepared one envelope with its correct address. if the four letters are to be put into 4 envelopes at random in how many ways can we put the letters so that only two of the letter goes to the right envelope? 2 4 1 6

asked Sep 14 in Combinatory by Surya Dhanraj Active (1.8k points) | 16 views

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1 answer

6

bipartite graph
a)G={V,E} be bipartite graph and vertex partition V={V1, V2} if suppose number of vertices in V1 is 3 and V2 is 4 then number of bipartite graphs from V1 to V2 is ____________ b)G={V,E} be bipartite graph and vertex partition ... } if suppose number of vertices in V1 is 3 and V2 is 4 then number of complete bipartite graphs from V1 to V2 is ____________

asked Sep 11 in Combinatory by A_i_$_h Loyal (4.6k points) | 26 views

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7

combinatorics
The number of even permutations of the multiset {1,1,2} is ___ .

asked Sep 10 in Combinatory by Vicky rix Loyal (3.7k points) | 24 views

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8

Binomial theorem doubt
Find the set of values of x for which expansion of (9+ 5x)^ -1/2 Is valid in ascending powers of x. a)(0,9/5) b)(-9/5,0) c)(-9/5,9/5) d)none

asked Sep 9 in Combinatory by Surya Dhanraj Active (1.8k points) | 16 views

+1 vote

1 answer

9

Permutation and combination doubt

asked Sep 7 in Combinatory by Surya Dhanraj Active (1.8k points) | 50 views

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10

self doubt
find no of primes not exceeding 100 by inclusion exclusion principle

asked Sep 5 in Combinatory by Kaluti Active (2.3k points) | 22 views

+1 vote

1 answer

11

Rosen Excercise 6.2
Show that if five integers are selected from the first eight positive integers, there must be a pair of these integers with a sum equal to 9. can i choose same interger five times? ex. if i choose integer 1 five times.

asked Sep 4 in Combinatory by Ananya Jaiswal 1 (21 points) | 21 views

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1 answer

12

NPTEL Question
Find the particular solution of the given Recurrence relation or Difference equation. ar - 5ar-1 + 6ar-2 = 2r + r

asked Sep 3 in Combinatory by Warrior Boss (5.4k points) | 30 views

+1 vote

1 answer

13

kenneth rosen
x1+x2+x3+x4+x5=21 how many solution are there to the equation if $0\leq$ x1 $\leq 3$ ,$1\leq$ x2$< 4$ and x3$\geq 15$

asked Sep 1 in Combinatory by Sunny123 (57 points) | 44 views

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14

Pigeonhole Principle
During a month with 30 days, a baseball team plays at least one game a day, but no more than 45 games. Show that there must be a period of some number of consecutive days during which the team must play exactly 14 games.

asked Aug 31 in Combinatory by Harish Karnam (345 points) | 25 views

+1 vote

2 answers

15

self doubt
how many subsets of a set with 100 elements have more than one element? answer should be 2^(100)-1 ot it should be 2^(100)-101 which one correct?

asked Aug 27 in Combinatory by Kaluti Active (2.3k points) | 26 views

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16

self doubt
how many among the first 500,000 positive integer contain exactly one of each 3 , 4 and 5 in their decimal representation

asked Aug 26 in Combinatory by Kaluti Active (2.3k points) | 20 views

+2 votes

2 answers

17

Discrete mathematics
what will be the number of even permutations of n objects? Explain!

asked Aug 20 in Combinatory by shipra tressa (185 points) | 33 views

+1 vote

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18

rosen example 20
how many different ways are there to seat 4 people around a circular table ,where two sittings are considered the same when each person has same left and right neighbour? [closed]

asked Aug 17 in Combinatory by saumya mishra (433 points) | 31 views

+1 vote

3 answers

19

UPSC prelim test
A bag contains 20 balls. 8 balls are green, 7 are white and 5 are red. What is the minimum number of balls that must be picked up from the bag blind-folded (without replacing any of it) to be assured of picking atleast one ball of each colour? a) 15 b) 16 c) 17 d)18

asked Aug 14 in Combinatory by gabbar Junior (867 points) | 80 views

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1 answer

20

#combinotirics
Find the largest integer value of x such that the following inequality holds: (10 C x-1) <2*(10 C x) In this question if solved line by line i am getting x<6. but clearly if you put x=7, it satisfies the inequality and 7 becomes the largest integer. Is there a procedure to get answer 7 step by step??

asked Aug 12 in Combinatory by jason33 (61 points) | 20 views

+1 vote

2 answers

21

counting
what does it mean that "each person has same left and right neighbour "?

asked Aug 10 in Combinatory by set2018 Loyal (3.5k points) | 58 views

+3 votes

1 answer

22

General Combinatorics
How many 6 digit numbers can be formed from 1, 2, 2, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6?

asked Aug 10 in Combinatory by rfzahid (273 points) | 172 views

+1 vote

0 answers

23

Sheldon Ross - Probability (2nd chapter)

asked Aug 5 in Combinatory by Surajit Junior (673 points) | 30 views

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24

Seldon Ross
A president,treasurer and secretary,all different,are to be chosen from a club consisting of 10 people.How many different choices of officers are possible if a)A and B will not serve together b)C and D serve together or not at all? c)E must be an officer? d)F will serve only if he is present?

asked Jul 30 in Combinatory by Pranabesh Ghosh 1 Loyal (3.5k points) | 27 views

+2 votes

1 answer

25

Seldon Ross
How many 5 digit numbers can be formed from the integers 1,2......9 if no digit can appear more than twice?

asked Jul 30 in Combinatory by Pranabesh Ghosh 1 Loyal (3.5k points) | 79 views

+1 vote

1 answer

26

combinatory
let S be the set of natural numbers whose digits are chosen from {1,3,5,7} such that no digits are repeated find 1) |S| 2) $\sum (n)$ where n belongs to s first part i know 64 numbers would be there how to approach 2nd part

asked Jul 27 in Combinatory by Kaluti Active (2.3k points) | 22 views

+1 vote

0 answers

27

combinatory
how many ways are there to seat n married couples(n>=3) around a table such that men and women alternate and each women is not adjacent to her husband?

asked Jul 27 in Combinatory by Kaluti Active (2.3k points) | 27 views

+1 vote

0 answers

28

#gate
Any good resource on Generating function and recurrrence relations ?

asked Jul 25 in Combinatory by saxena0612 Active (1.8k points) | 16 views

+1 vote

0 answers

29

Is Summation topic in GATE syllabus

asked Jul 23 in Combinatory by iarnav Loyal (3.4k points) | 12 views

+3 votes

1 answer

30

Combination (Repetition)
A girl has to choose 4 items from a bucket which contains 3 red, 3 green, and 4 blue balls, now in how many ways she can do this?

asked Jul 22 in Combinatory by Shubhanshu Boss (5.9k points) | 58 views

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