One mapping is selected at random from all mappings of the set A = {1, – InterviewSolution

1.	One mapping is selected at random from all mappings of the set A = {1, 2, 3, ..., n} into itself. The probability that the mapping selected is one to one is(a) 1nn (b) 1n! (c) n-1!nn-1 (d) None of these
Answer» One mapping is selected at random from all mappings of the set A = {1, 2, 3, ..., n} into itself. The probability that the mapping selected is one to one is (a) $\frac{1}{n^{n}}$ (b) $\frac{1}{n!}$ (c) $\frac{(n - 1)!}{n^{n - 1}}$ (d) None of these

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