Recent questions in Combinatory

+2 votes

1 answer

Kenneth Rosen chapter 6.4 question no 35

asked 2 days ago in Combinatory by Rameez Raza Active (2.4k points) | 28 views

0 votes

0 answers

Convex N-sided polygon color problem.

asked 2 days ago in Combinatory by Aghori Boss (5.4k points) | 16 views

+1 vote

0 answers

Solution of non - homogeneous Recurrence relation

asked 2 days ago in Combinatory by Chhotu Boss (5k points) | 19 views

+1 vote

1 answer

P and C doubt
Given a 4 *4 grid points , how many Triangles with vertices on the grid can be formed?

asked Oct 13 in Combinatory by Surya Dhanraj Loyal (2.8k points) | 32 views

+3 votes

1 answer

P and C doubt
Number of ways in which the corner of the square can coloured with two colours. It is permissible to use single colour on all four corners?

asked Oct 13 in Combinatory by Surya Dhanraj Loyal (2.8k points) | 48 views

+1 vote

1 answer

P and C doubt
In how many ways can 10 different books be distributed to three students A B C so that student A receives at least one book? In how many ways can 10 different books be distributed to three students ? In how many ways can 10 ... student receives at least 3 books? How to solve these types of questions... Any type of assistance would be appreciated..

asked Oct 13 in Combinatory by Surya Dhanraj Loyal (2.8k points) | 21 views

+2 votes

0 answers

boys and 4 girls have to sit in a row with all arrangements equally likely

asked Oct 12 in Combinatory by Sanjay Sharma Veteran (47.1k points) | 22 views

+1 vote

2 answers

K. Rosen: Countings
Question How many different strings of length 2 can be made from the letters in 'ORONO'? I am getting 7 strings as follows: OO, ON, OR, NO, RO, RN, NR but given answer is 6.

asked Oct 12 in Combinatory by manu00x Veteran (15.8k points) | 38 views

+2 votes

0 answers

P & C doubt
In how many Ways can 5 numbers be selected and arranged in ascending order from set 1 2 3 4 5 6 7 8 9 10? Ans. Is it 10C5 * 1ways Please correct me if I m wrong..

asked Oct 11 in Combinatory by Surya Dhanraj Loyal (2.8k points) | 16 views

+4 votes

2 answers

P and C doubt
How many number must be chosen from site {1 2 3 4 5 6 7 8 }such that at least two of them must have sum equal to 9? A.28 B.9 C.5 D.10

asked Oct 11 in Combinatory by Surya Dhanraj Loyal (2.8k points) | 59 views

+1 vote

0 answers

#self_doubt #
1.how many outcome are appear if the dice thrown 10 times ? and 2.how many way to arrange (1,2,3....13) into 8x8 matrix #doubt _both are looking same question but in 1st we apply diffrent method and in 2nd we apply diff so can we avoid these type of doubt...

asked Oct 10 in Combinatory by air1ankit Active (1.9k points) | 12 views

+1 vote

0 answers

generating function
generating function shifted Fibonacci sequence (what we actually do while finding generating function)

asked Oct 9 in Combinatory by air1ankit Active (1.9k points) | 21 views

+1 vote

0 answers

discrete mathematics doubt .!
What is the generating function for the sequence of Fibonacci numbers?

asked Oct 9 in Combinatory by air1ankit Active (1.9k points) | 13 views

+1 vote

0 answers

UGCNET-Jan2017-II-4
How many multiples of 6 are there between the following pairs of numbers ? 0 and 100 and –6 and 34 (1) 16 and 6 (2) 17 and 6 (3) 17 and 7 (4) 16 and 7

asked Oct 8 in Combinatory by amaity Loyal (3.2k points) | 25 views

+2 votes

1 answer

# doubt

asked Oct 7 in Combinatory by Angkit Loyal (3k points) | 47 views

+3 votes

1 answer

combinatory
Consider all possible permutations of eight distinct elements a, b, c, d, e, f, g, h. In how many of them, will d appear before b? Note that d and b may not necessarily be consecutive.

asked Oct 7 in Combinatory by Kaluti Loyal (3.2k points) | 40 views

+2 votes

2 answers

kenneth rosen relations
How many of the 16 different relations on {0,1} contain the pair (0,1)?

asked Oct 7 in Combinatory by Uma Maheswari Junior (587 points) | 43 views

+1 vote

1 answer

testbook test series
number of string of length 3 using 4 distinct alphabet... including string of length zero and what if dont.?

asked Oct 7 in Combinatory by rohit vishkarma (285 points) | 33 views

+2 votes

2 answers

combinatorics
que- in how many way can 7 girl are seated at a round table so that 2 particular girl are seprated ???

asked Oct 3 in Combinatory by air1ankit Active (1.9k points) | 62 views

0 votes

1 answer

ace test
How many ways consonant and vowels can be arranged alternatively for letters of word CONSTITUTION .

asked Sep 30 in Combinatory by ADITYA CHAURASIYA 5 (467 points) | 38 views

+1 vote

0 answers

Combinatorics
The letters of the word ALLAHABAD are rearranged to form new words and put in a dictionary. If the dictionary has only these words and one word on every page in alphabetical order then what is the page number on which the word LABADALAH comes?

asked Sep 26 in Combinatory by Tuhin Dutta Active (2.3k points) | 25 views

+2 votes

1 answer

Combinatorics
Three variables x,y,z have a sum of 30. All three of them are non=negative integers. If any two variables don't have the same value and exactly one variable has a value of less than or equal to three, then find the number of possible solutions for the variables.

asked Sep 26 in Combinatory by Tuhin Dutta Active (2.3k points) | 52 views

0 votes

1 answer

KENNETH- rosen book excercise
How many solutions are there to the equation x1 + x2 + x3 + x4 + x5 = 21 where 0 <= x1 <= 3 , 1 <= x2 < 4 and x3 >= 15 ?

asked Sep 25 in Combinatory by Monika Sharma 1 (377 points) | 36 views

0 votes

1 answer

Simple recurrence relation question

asked Sep 23 in Combinatory by Rajesh R (467 points) | 43 views

+3 votes

1 answer

generating function
Let p be an odd prime number. Find the number of subsets A of the set {1, 2, …, 2p} such that (i) A has exactly p elements, and (ii) the sum of all the elements in A is divisible by p.

asked Sep 23 in Combinatory by Kaluti Loyal (3.2k points) | 30 views

0 votes

1 answer

PERMUTATIONS

asked Sep 17 in Combinatory by Parshu gate Junior (627 points) | 39 views

0 votes

1 answer

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 Sep 17 in Combinatory by Divyanshu Tiwari (15 points) | 16 views

0 votes

1 answer

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 Sep 16 in Combinatory by Kaluti Loyal (3.2k points) | 23 views

0 votes

1 answer

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 Loyal (2.8k points) | 35 views

+1 vote

1 answer

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 Loyal (2.8k points) | 24 views

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