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Recent questions in Combinatory
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Combinatorics:
Counting,
Recurrence relations,
Generating functions.
Recent
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Previous GATE
+2
votes
0
answers
1
Recurrence
Answer given as 5050 i am getting 4950
asked
20 hours
ago
in
Combinatory
by
Inspiron
(
371
points)

16
views
recurrence
+2
votes
0
answers
2
Mathematics
A box contains 6 red, 8 green, 10 blue, 12 yellow and 15 white balls. What is the minimum no. of balls we have to choose randomly from the box to ensure that we get 9 balls of same color? How to solve such problems using pigeonhole principle?
asked
1 day
ago
in
Combinatory
by
gauravkc
Active
(
1.9k
points)

27
views
discretemathematics
engineeringmathematics
permutationsandcombinations
+2
votes
1
answer
3
Test series
asked
1 day
ago
in
Combinatory
by
Ismail
(
271
points)

43
views
acetestseries
discretemathematics
permutationsandcombinations
settheory&algebra
+1
vote
1
answer
4
permutations and combinations
Find the number of ways to distribute 10 books in 3 shelves. I considered it as an ordered problem which is fully unspecified. So, answer should be 310. But the given answer is 12P2. Where am i going wrong?
asked
2 days
ago
in
Combinatory
by
Nymeria
(
271
points)

42
views
permutationsandcombinations
discretemathematics
+2
votes
2
answers
5
Combinatory
Kindly help...thanks
asked
3 days
ago
in
Combinatory
by
Pawan Kumar 2
Loyal
(
4k
points)

43
views
gcd
+4
votes
0
answers
6
Combinatorics(Bookshelf_Problem)
asked
4 days
ago
in
Combinatory
by
saxena0612
Veteran
(
10.3k
points)

82
views
engineeringmathematics
+3
votes
0
answers
7
The number of possibilities to place exactly one letter in its correct envelop ________.
asked
4 days
ago
in
Combinatory
by
Rohit Gupta 8
Active
(
2.1k
points)

50
views
permutationsandcombinations
discretemathematics
engineeringmathematics
+1
vote
1
answer
8
[Ace Test Series]
Answer given is 14
asked
5 days
ago
in
Combinatory
by
ashish pal
Junior
(
933
points)

24
views
acetestseries
engineeringmathematics
+2
votes
1
answer
9
How to find the number of solutions value of (n,p) to satisfy (5*n + 9*p) = 23
asked
5 days
ago
in
Combinatory
by
hem chandra joshi
Loyal
(
4.8k
points)

33
views
generatingfunctions
+2
votes
0
answers
10
Made easy mock 1 Q:30 (201718)
[closed]
asked
5 days
ago
in
Combinatory
by
G.K.T
Active
(
2k
points)

24
views
discretemathematics
madeeasytestseries
+1
vote
1
answer
11
test series
asked
6 days
ago
in
Combinatory
by
Ravinder Kumar
(
41
points)

30
views
0
votes
1
answer
12
how to find number of terms in gp
asked
Jan 14
in
Combinatory
by
iarnav
Veteran
(
17.1k
points)

39
views
algorithms
discretemathematics
+2
votes
1
answer
13
recurrence relation
asked
Jan 13
in
Combinatory
by
pranab ray
Active
(
1.4k
points)

53
views
recurrence
discretemathematics
+1
vote
0
answers
14
made easy mock test
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 __________.
[closed]
asked
Jan 13
in
Combinatory
by
mohit kumar 5
Junior
(
733
points)

48
views
permutationsandcombinations
generatingfunctions
madeeasytestseries
+2
votes
0
answers
15
The number of ways six distinct balls be distributed into 3 distinct urns. If each urn contain at least one ball are
asked
Jan 12
in
Combinatory
by
Rohit Gupta 8
Active
(
2.1k
points)

62
views
permutationsandcombinations
engineeringmathematics
discretemathematics
+1
vote
2
answers
16
Counting problem
If I have 4 digit number formed using 5,6,7,8. What is the sum of all such 4 digit numbers? Please provide the detailed solution, I am unable to follow counting problems. Thank You.
asked
Jan 11
in
Combinatory
by
AnilGoudar
Loyal
(
4.3k
points)

63
views
discretemathematics
counting
permutationsandcombinations
+1
vote
0
answers
17
Counting
I am solving with Pigeon Hole Principle. Please correct me if I am wrong. Considering the required number of books as pigeons, days of the month as pigeonholes with 3 pigeons per day. if my approach is wrong, please correct me
asked
Jan 11
in
Combinatory
by
AnilGoudar
Loyal
(
4.3k
points)

51
views
permutationsandcombinations
counting
discretemathematics
+5
votes
0
answers
18
Combinatorics (Shai Simonson)
How many n length base 10 numbers are there with at least 3 zeros?
asked
Jan 9
in
Combinatory
by
Mk Utkarsh
Loyal
(
3.6k
points)

97
views
shaisimonson
permutationsandcombinations
+1
vote
0
answers
19
Counting double
How many different pairs can be formed from 10 people?
[closed]
asked
Jan 8
in
Combinatory
by
Mk Utkarsh
Loyal
(
3.6k
points)

32
views
permutationsandcombinations
discretemathematics
+1
vote
0
answers
20
Solve the following recurrence relation:
asked
Jan 8
in
Combinatory
by
gari
Loyal
(
2.6k
points)

51
views
discretemathematics
recurrence
+2
votes
0
answers
21
Arrangement
How many ways are there to distribute 10 balls into 6 boxes with atmost 4 balls in first 2 boxes if the balls are in distinguishable?
asked
Jan 7
in
Combinatory
by
srestha
Veteran
(
76.8k
points)

65
views
permutationsandcombinations
+3
votes
0
answers
22
[ACE Test Series] Combinatorics
asked
Jan 6
in
Combinatory
by
ashish pal
Junior
(
933
points)

54
views
acetestseries
permutationsandcombinations
discretemathematics
+1
vote
0
answers
23
[ACE test series] maths
Answer is B as given in solution.
asked
Jan 6
in
Combinatory
by
ashish pal
Junior
(
933
points)

26
views
acetestseries
discretemathematics
+1
vote
0
answers
24
find the number of positive integer less than 91 and relatively prime to 91 ?
asked
Dec 31, 2017
in
Combinatory
by
adarsh shivhare
(
131
points)

26
views
+1
vote
1
answer
25
combinatory
From a group of 10 professors how many ways can a committee of 5 members can be formed so that atleast one of the professor A and professor B will be included ?
asked
Dec 31, 2017
in
Combinatory
by
adarsh shivhare
(
131
points)

22
views
+1
vote
1
answer
26
Probability
Two cards are drawn together from a pack of 52 cards. The probability that one is spade and other is king, is a) 1/26 b)2/51 c)8/221 d)None of these
asked
Dec 29, 2017
in
Combinatory
by
SSrawat
(
157
points)

47
views
0
votes
0
answers
27
GATECS2014(Set3)  Question 12
[closed]
asked
Dec 26, 2017
in
Combinatory
by
aishwarydewangan
(
373
points)

51
views
gate20143
discretemathematics
0
votes
0
answers
28
How many triangles are formed by selecting points from a set of 15 points out of which 8 are collinear?
asked
Dec 25, 2017
in
Combinatory
by
Rohit Gupta 8
Active
(
2.1k
points)

66
views
permutationsandcombinations
0
votes
0
answers
29
NIELITDEC 2017 set c 115
In boolean algebra 1+1+1+1+..........800 times ones A) 0 B)1 C)11 D)800
asked
Dec 24, 2017
in
Combinatory
by
mohitbawankar
Boss
(
5.1k
points)

50
views
+3
votes
0
answers
30
combinatorics
How many threedigit numbers are there such that no two adjacent digits of the number are consecutive ?
asked
Dec 24, 2017
in
Combinatory
by
Prabhanjan_1
Veteran
(
12.6k
points)

45
views
discretemathematics
permutationsandcombinations
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