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If n gt= 2 then the number of onto mappi...

If `n gt= 2` then the number of onto mappings (surjections) that can be defined from the set `A = {1, 2, 3…, n}onto `B = {a, b}` is

A

`n^2`

B

`2^n`

C

`n^2-2`

D

`2^n-2`

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The correct Answer is:
D
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