1.

A is a set containing n elements. A subset P of A is chosen. The set A is reconstructed by replacing the elements of P. A subset of A is again chosen. Number of ways of choosing P and Q so that PcapQ contains exactly one element is

Answer»

`3^(N)`
`3^(n-1)`
`n.3^(n-1)`
`n.3^(n)`

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