Recent questions in Combinatory

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1

#combinatory
Determine the number of factors of 34 * 52 * * 117 * 138.

asked 3 days ago in Combinatory by Nachiket Karambelkar (165 points) | 42 views

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1 answer

2

#Discrete #Combinatorics
The number of ways in which n distinct objects can be put into two identical boxes so that no box remains empty, is a) 2^n - 1 b) 2^n - 2 c) 2^(n-1) - 1 d) None of these Please explain your answer.

asked Jun 11 in Combinatory by Jatin18 (47 points) | 49 views

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1 answer

3

[Discrete Maths] Counting ,Number of solutions to the equation

asked Jun 10 in Combinatory by rahul sharma 5 Loyal (4.8k points) | 44 views

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4

recurrence relation (rosen )
solve the given recurrence relation ? $a_{n}=3a_{n/2}+n$ n=2^k , $a_{1}$=1 by changing the variables $b_{k}=3b_{k-1}+2^{k}$ after solving this i got c1.$3^{k}-2.2^{k}$ now i am facing difficulty to find the value of c1 ... might be silly can some one help me

asked Jun 4 in Combinatory by sid1221 Junior (865 points) | 10 views

+1 vote

1 answer

5

Generating function , closed form

asked Jun 3 in Combinatory by sid1221 Junior (865 points) | 26 views

+3 votes

0 answers

6

Rosen example ( generating function)

asked Jun 3 in Combinatory by sid1221 Junior (865 points) | 28 views

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1 answer

7

Generalised permutation and combination

asked Jun 2 in Combinatory by sid1221 Junior (865 points) | 34 views

+1 vote

1 answer

8

Permutation
How many strings with 5 or more characters can be formed from the letter SEERESS ? Verify the answer ...

asked Jun 2 in Combinatory by sid1221 Junior (865 points) | 32 views

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0 answers

9

Kenneth rosen exercise 6.3 Q.29

asked Jun 1 in Combinatory by anumita (495 points) | 25 views

+1 vote

2 answers

10

Cominatroics
There are 12 copies of Mathematics, 7 copies of Engineering, 3 different books on Medicine and 2 different books on Economics. Find the number of ways in which one or more than one book can be selected? A. 3421 B. 3111 C. 3327 D. 3201

asked May 31 in Combinatory by Gate Ranker18 (449 points) | 32 views

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1 answer

11

#combinatroics
An elevator starts at the basement with 8 people (not including the elevator operator) and discharges them all by the time it reaches the top floor, number 6. In how many ways could the operator have perceived the people leaving the elevator if all ... ? What if the 8 people consisted of 5 men and 3 women and the operator could tell a man from a woman?

asked May 30 in Combinatory by Gate Ranker18 (449 points) | 67 views

+1 vote

1 answer

12

#seldom_ross_chapter1_problems_23

asked May 29 in Combinatory by Anil Khatri Loyal (3.1k points) | 31 views

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0 answers

13

Discrete Mathematics and its applications - Kenneth Rosen, Counting - Basics of Counting - Exercise 51 [closed]

asked May 26 in Combinatory by Ishan (43 points) | 26 views

+1 vote

1 answer

14

Kenneth rosen chp 6 question 39 counting

asked May 17 in Combinatory by anumita (495 points) | 49 views

+1 vote

1 answer

15

Kenneth rosen chapter 6 question 41 counting

asked May 17 in Combinatory by anumita (495 points) | 41 views

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1 answer

16

Kenneth rosen chapter 6 question 17 counting

asked May 17 in Combinatory by anumita (495 points) | 26 views

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2 answers

17

basic aptitude
12 chairs are arranged in a row and are numbered 1 to 12 4 men have to be seated in these chairs so that the chairs numbered 1 and 8 should be occupied and no two men occupy adjacent chairs. Find the number of ways the task can be done. A. 360 B. 384 C. 432 D. 470

asked May 15 in Combinatory by sid1221 Junior (865 points) | 67 views

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1 answer

18

basic aptitude
The letter of the word LABOUR are permuted in all possible ways and the words thus formed are arranged as in a dictionary. What is the rank of the word LABOUR? A. 275 B. 251 C. 240 D. 242 can someone give me proper way to solve ?

asked May 15 in Combinatory by sid1221 Junior (865 points) | 55 views

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1 answer

19

Subsequence Theorem From Rosen.

asked May 15 in Combinatory by bhuv (255 points) | 44 views

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1 answer

20

maths
In how many ways three girls and nine boys can be seated int two vans each having numbered seats ,3 in the front and and 4 at the back ? How many arrangements are possible if 3 girls sit together in back row on adjacent seats?

asked May 12 in Combinatory by Shashank Kumar Mishr Junior (527 points) | 53 views

+1 vote

2 answers

21

basic aptitude
Ten different letters of alphabet are given, words with 5 letters are formed from these given letters. Then, the number of words which have at least one letter repeated is: A. 69760 B. 30240 C. 99748 D. 42386 i got ans from the method totol words - ... 10*10*9*5!/4! + 10*10*10*10*!0 from this getting different ans where is going wrong ? someone verify pls

asked May 10 in Combinatory by sid1221 Junior (865 points) | 89 views

+1 vote

0 answers

22

#rosen , #counting , #5.1 , 41(a)

asked May 7 in Combinatory by saket nandan Loyal (3.4k points) | 180 views

0 votes

1 answer

23

Discrete Mathematics Thegatebook

asked May 7 in Combinatory by Lakshman Patel RJIT Junior (565 points) | 69 views

+1 vote

1 answer

24

combinatorics
In how many ways 8 different shirts can be distributed to 4 different people so that each will get 2 shirts?

asked Apr 28 in Combinatory by Shubhanshu Active (1.7k points) | 75 views

+1 vote

1 answer

25

combinatorics
Number of 5 digit number having there digits in non decreasing order (from left to right) constructed by using the digits belonging to the set {1, 2, 3, 4, 5, 6, 7, 8, 9} ?

asked Apr 28 in Combinatory by Shubhanshu Active (1.7k points) | 65 views

0 votes

1 answer

26

Generalised permutation combinations

asked Apr 22 in Combinatory by Arnabi Boss (6k points) | 65 views

+2 votes

1 answer

27

rosen
A shelf holds 12 books in a row. How many ways are there to choose five books so that no two adjacent books are chosen?

asked Apr 21 in Combinatory by sushmita Boss (6.7k points) | 122 views

+1 vote

2 answers

28

Combinatorics
A bagel shop has onion bagels, poppy seed bagels, egg bagels, salty bagels, pumpernickel bagels, sesame seed bagels, raisin bagels, and plain bagels. How many ways are there to choose a dozen bagels with at least three egg bagels and no more than two salty bagels?

asked Apr 21 in Combinatory by Arnabi Boss (6k points) | 58 views

+1 vote

2 answers

29

rosen discrete
How many strings of six lowercase letters of the English alphabet contain exactly two vowel?

asked Apr 19 in Combinatory by Nirmal Gaur Junior (709 points) | 61 views

0 votes

1 answer

30

Fibonacci series
Let a,b,c,d are 4 consecutive numbers of Fibonacci series. Prove or dis-approve: ad-bc= ±1

asked Apr 14 in Combinatory by Mandeep Singh Active (1.3k points) | 45 views

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