1.

Let A and B be two finite sets having m and n elements respectively such that m gt n. A mapping is selected at random from the set of all mappings from A to B. The probability that the mapping selected is an injective mapping is

Answer»

`(N!)/((n-m)!m^(n))`
`(n!)/((n-m)!n^(m))`
`(m!)/((n-m)!n^(m)`
none

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