A set {1,2,3,4,5} , two subset of A and B are chosen. Find probability such that `n(AnnB)=2`

Let X be a set containing n elements.Two subsets A and B of X are chosen at random, the probability that A uu B=X is

A is a set having n elements. A subset P of A is chosen at random. The set A is reconstructed by replacing the elements of A. A subset Q of A is again chosen at random. Find the probability that P and Q have no common elements.

Two digits are chosen at random from the digits 1,2,3,......,9; if the sum of the chosen digits is odd,find probability that one of the chosen digit is 6 .

A subset A of the set X={1.2,3.....100} is chosen at random.The set X is reconstructed by replacing the elements of A,and another subset B of X is chosen at random.Then the probability that A nn B contains exactly 10 elements is

Suppose A is a set containing n elements. Two subsets P and Q of A are chosen at random. If the probability that P is a subset of Q is 243/1024, then n is equal to

Two subsets A and B of a set containing n elements are chosen at random.The probability that A sube B is