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Coordination Isomerism

Let X be a se...

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Let X be a set containing n elements .Two subset A and B of X are chosen at random the probability that a union B equal to X is?

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X

be a set containing n elements. Two subsets

A

B

X

are chosen at random, the probability that

A \cup B = X

L e t X b e a s e t c o n t a i n i n g n e l e m e n t s . T w o s u b s e t s A a n d B o f X a r e c h o s e n a t r a n d o m, t h e p r o b a b i l i t y t h a t

A \cup B = X

Q. Let A be a set containing n elements. A subset P of the set A is chosen at random.The set A is reconstructed by replacing the elements of

P

and another subset

Q

of A is chosen at random. The probability that

P \cap Q

contains exactly

m (m < n)

A

be a set containing

n

elements. A subset

P

A

is chosen at random.
The set

A

is reconstructed by replacing the element of

P

, and another subsets

Q

A

is chosen at random. The probability that

(P \cap Q)

contains exactly

m (m < n)

Q. A is a set containing n elements. Two subsets P and Q of A are chosen at random. (P and Q may have elements in common). The probability that

P \cup Q \neq A

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