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Recent questions in Discrete Mathematics

1 votes
1 answer
4083
set theory
How many minimum number must be chosen from a set {1,2,3,...8} such that at least 2 of them must have sum=9?
How many minimum number must be chosen from a set {1,2,3,...8} such that at least 2 of them must have sum=9?
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2 votes
1 answer
4084
is statement written in red also true ?? anyone
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0 votes
0 answers
4085
Linearity
Is this function is linear? f(X,Y,Z)=XY+X'Y'Z
Is this function is linear?f(X,Y,Z)=XY+X'Y'Z
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0 votes
0 answers
4086
Math on set theory
The number of pairs of set (X,Y) are there that satisfy the condition $X,Y\subseteq \left \{ 1,2,3,4,5,6 \right \}$ and $X\cap Y=\Phi$________________
The number of pairs of set (X,Y) are there that satisfy the condition $X,Y\subseteq \left \{ 1,2,3,4,5,6 \right \}$ and $X\cap Y=\Phi$________________
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0 votes
0 answers
4087
Mathematical logic
What is the first order logic representation for the sentence "Not every satisfiable logic is valid"
What is the first order logic representation for the sentence"Not every satisfiable logic is valid"
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1 votes
1 answer
4088
Permutation and combination doubt
In how many ways 3 friends ram ,rajat and rupesh having 6 one rupee coins, 7 one rupee coins ,8 one rupee coins respectively donate 10 rupees collectively. a)40 b)45 c)47 d)50
In how many ways 3 friends ram ,rajat and rupesh having 6 one rupee coins, 7 one rupee coins ,8 one rupee coins respectively donate 10 rupees collectively.a)40b)45c)47d)5...
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1 votes
2 answers
4089
doubt . which statement is accurate ?
cardinality of sets is number of elements in set -- wikipedia but in many sites they wrote cardinality is no. of DISTINCT elements in the set ? which is correct
cardinality of sets is number of elements in set wikipediabut in many sites they wrote cardinality is no. of DISTINCT elements in the set ?which is correct
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1 votes
1 answer
4091
Graph theory Narshing Deo
theorem no 10.1 Narsingh Deo prove that the no. of labeled graph of n vertices of n is 2^(n(n-1)/2)
theorem no 10.1 Narsingh Deoprove that the no. of labeled graph of n vertices of n is 2^(n(n-1)/2)
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0 votes
0 answers
4092
self doubt
find no of primes not exceeding 100 by inclusion exclusion principle
find no of primes not exceeding 100 by inclusion exclusion principle
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1 votes
3 answers
4093
Set theory doubt
Say if A is proper subset of B i.e A⊂B then is it true - that B⊆A (B is subset of A)? Also one more thing - if A⊂B then AUB = A where U means UNION
Say if A is proper subset of B i.e A⊂B then is it true - that B⊆A (B is subset of A)?Also one more thing - if A⊂B then AUB = A where U means UNION
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1 votes
1 answer
4094
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.
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 f...
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1 votes
0 answers
4095
doubt
Is a null matrix also a diagonal matrix? i read somewhere atleast one element in diagonal should be non zero to be a diagonal matrix //provided null matrix will be square and can a null square matrix be a scalar matrix ?
Is a null matrix also a diagonal matrix? i read somewhere atleast one element in diagonal should be non zero to be a diagonal matrix //provided null matrix will be squar...
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0 votes
1 answer
4096
NPTEL Question
Find the particular solution of the given Recurrence relation or Difference equation. ar - 5ar-1 + 6ar-2 = 2r + r
Find the particular solution of the given Recurrence relation or Difference equation.ar - 5ar-1 + 6ar-2 = 2r + r
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0 answers
4098
Graph Theory Non isomorphic
How many number of Non-isomorphism Possible Graph M vertices and E edges ? If any Shortcut Formula
How many number of Non-isomorphism Possible Graph M vertices and E edges ? If any Shortcut Formula
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1 votes
1 answer
4100
sets and relations
What are all the possible relations over a set A{1,2}? Pease explain in detail.
What are all the possible relations over a set A{1,2}? Pease explain in detail.
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