AIEEE Exam

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

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AIEEE Other Question

There are 5 letters and 5 addressed envelopes. If the letters are put at random in the envelops, the probability that all the letters may be placed in wrongly addressed envelopes is 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