A mapping is selected at random from the set of all the mappings of the set of A= {1,2,3,4} into itself. The probability that the mapping selected is a bijection is

A mapping is selected at random from the set of all the mappings of the set of A= {1,2,3,4,5} into itself. The probability that the mapping selected is a bijection is

A mapping is selected at random from the set of all the mappings of the set A={1,2,...,n} into itself. Find the probability that the mapping selected is an injection.

A mapping is selected at random from the set of all the mappings of the set A={1,2,...,n} into itself. Find the probability that the mapping selected is an injection.

A mapping is select at random from the set of all the mappings of the set A={1,2, n} into itself. Find the probability that the mapping selected is an injection.

A mapping is select at random from the set of all the mappings of the set A={1,2, n} into itself. Find the probability that the mapping selected is an injection.

A mapping is select at random from the set of all the mappings of the set A={1,2,...,n} into itself,Find the probability that the mapping selected is an injection.