AIEEE Exam

A binary operation is chosen at random from the set of all binary operations on a set A containing n elements. The probability that the binary operation is commutative is

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AIEEE Other Question

Let S be a set containing n elements. Two subsets A and B of S are chosen at random. The probability that A + B = S is If there dice are thrown, the probability that they show the numbers in A.P. is