Recent questions in Combinatory

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1

generating fn(made easy)
SHOULDN'T THE ANSWER BE 715; 10+4-1C4 [closed]

asked 18 hours ago in Combinatory by Gate Fever Active (1.1k points) | 19 views

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2

Permutation and combination

asked 2 days ago in Combinatory by Deepalitrapti Junior (663 points) | 45 views

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1 answer

3

Discrete mathematics

asked 2 days ago in Combinatory by Deepalitrapti Junior (663 points) | 59 views

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4

Discrete mathematics recurrence relation

asked 2 days ago in Combinatory by Deepalitrapti Junior (663 points) | 21 views

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5

gatebook test series
I am damn sure that answer for this question should be C ONLY. but given answer is A. Pls verify.

asked 2 days ago in Combinatory by Utkarsh Joshi Active (2.2k points) | 79 views

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6

General Doubt on Generating Functions
Given only a Generating Function in closed form can we find the sequence it represents? If so, how? Please explain with an example.If not, given a GF(closed form) in general what information does it convey to us about a series if the series is not provided ?

asked 2 days ago in Combinatory by tonystark (81 points) | 4 views

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7

virtual gate

asked 3 days ago in Combinatory by Prince Sindhiya Active (3.6k points) | 23 views

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1 answer

8

Rosen Generating functions
Find a closed form of the generating function of the following sequence $0, 1, -2, 4, -8, 16, -32,64,.....$

asked 4 days ago in Combinatory by Mk Utkarsh Boss (20.1k points) | 26 views

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9

counting rosen
how many words can be made from the word apple a)with repetition b)without repetition

asked 5 days ago in Combinatory by rtalwar (79 points) | 14 views

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10

rosen counting
How many bit strings with length not exceeding n ,where n is a positive integer ,consist entirely of 1's?

asked 5 days ago in Combinatory by rtalwar (79 points) | 31 views

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1 answer

11

rosen counting
A multiple choice test contains 10 questions There are 4 possible answers for each question? a)How many ways can a student answer the questions on the test if the student answers every question? b)How many ways can a student answer the questions on the test if the student can leave answers blank?

asked 5 days ago in Combinatory by rtalwar (79 points) | 17 views

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1 answer

12

Find closed form for the generating function

asked 6 days ago in Combinatory by Mk Utkarsh Boss (20.1k points) | 21 views

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13

permutation and combination(doubt)
Q.1) find total number of 4 letter word which can be formed by using letter of word ALLAHABAD.in such a manner that there is exactly 2two letter are same and rest are different.

asked 6 days ago in Combinatory by BASANT KUMAR Active (1.9k points) | 26 views

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1 answer

14

permutation and combination(simple question)

asked Oct 11 in Combinatory by BASANT KUMAR Active (1.9k points) | 60 views

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15

permutation and combination(basic question)

asked Oct 11 in Combinatory by BASANT KUMAR Active (1.9k points) | 43 views

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16

ACE_Test_Series
A set S has 5 elements. How many ways we can choose subsets P and Q of S .So , that (P $\cap$ Q) = $\Phi$

asked Oct 11 in Combinatory by Magma Loyal (5.3k points) | 76 views

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17

permutation and combination(self doubt NPTEL)

asked Oct 10 in Combinatory by BASANT KUMAR Active (1.9k points) | 22 views

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18

Rosen Doubt
In how many ways n distinguishable books can be placed in k distinguishable shelf and position of the books matter? pls explain in details

asked Oct 9 in Combinatory by aditi19 Junior (863 points) | 19 views

+1 vote

1 answer

19

keneth rosen chapter 6 ex21
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 ways can the playoff occur? (solution without manual calculation).

asked Oct 9 in Combinatory by Sankalp20894 (213 points) | 10 views

+1 vote

1 answer

20

whichever is sooner
You roll two fair dice. If the sum of the numbers shown is 7 or 11, you win; if it is 2, 3, or 12, you lose. If it is any other number j, you continue to roll two dice until the sum is j or 7, whichever is sooner. If it is 7, you lose; if it is j, you win. What is the probability p that you win? Reference : Elementary probability by David Stirzaker

asked Oct 9 in Combinatory by MIRIYALA JEEVAN KUMA Active (2.2k points) | 25 views

+1 vote

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21

Each player drops out of the game immediately upon throwing a six.

asked Oct 9 in Combinatory by MIRIYALA JEEVAN KUMA Active (2.2k points) | 4 views

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22

Four cups and saucers
A tea set has four cups and saucers with two cups and saucers in each of two different colours. If the cups are placed at random on the saucers, what is the probability that no cup is on a saucer of the same colour?

asked Oct 9 in Combinatory by MIRIYALA JEEVAN KUMA Active (2.2k points) | 5 views

+1 vote

1 answer

23

Self doubt #Generating functions
$\sum_{.}^{.} (3r^{2} + 5r -21) x^{r}$will be equal to :?

asked Oct 8 in Combinatory by Priyanka17 Active (1k points) | 32 views

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1 answer

24

Recurrence Relation
Let $T(n) = T(n-1) + \frac{1}{n} , T(1) = 1 ;$ then $T(n) = ? $ $A) O(n^{2})$ $B) O(logn)$ $C) O(nlogn)$ $D) O(n^{2}logn)$

asked Oct 5 in Combinatory by Lakshman Patel RJIT Loyal (9.6k points) | 44 views

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1 answer

25

Number of Strings
Number of strings up to length $3$ on alphabet set $\sum$ = { a,b,c,d } are :(including,string of length zero)? $A) 16 $ $B) 85 $ $C) 128 $ $D) 64 $

asked Oct 5 in Combinatory by Lakshman Patel RJIT Loyal (9.6k points) | 49 views

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26

cormen 7th edition counting
How many ways are there for a horse race with three horses to finish if ties are possible?(Note: Two or three horses may tie) My answer is 9 but correct answer is 13. In the solution they have even considered the case of all three horses tying ... is it possible that in 3 horses race all three tie at third position? How can we get third without getting first and second? [closed]

asked Oct 5 in Combinatory by sushmita Boss (14.7k points) | 23 views

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27

NPTEL ASSIGNMENT
In how many ways can 12 apples be distributed among John, Grace and Gloria, such that John gets at least 4, Grace gets at least 2 and Gloria gets at least 2? [closed]

asked Oct 4 in Combinatory by Bikash Singh (43 points) | 9 views

+2 votes

1 answer

28

Combinatorics
There are n hats and k people (where k<n). $1)$ How many ways we can assign each person a hat? $2)$ How many ways we can assign each person atleast a hat?

asked Oct 2 in Combinatory by srestha Veteran (98.4k points) | 79 views

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29

ACE mock test
what is the approach to solve these kind of questions???

asked Oct 2 in Combinatory by garimanand Junior (677 points) | 25 views

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1 answer

30

kenneth rosen
FIND THE COEFFICIENT OF X^10 (x^3+x^4+x^5+x^6+x^7....)^3 FIND THE COEFFICIENT OF X^9 (1+x+x^2)^3

asked Oct 2 in Combinatory by altamash (91 points) | 25 views

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content	content:apple
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force match	+apple
views	views:100
score	score:10
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is accepted	isaccepted:true
is closed	isclosed:true

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