Test Academy | Let A = {1, 2,3,…. n} and B = { a, b}. Then the number of surjections from A into B is ⁿP2, 2n - 2, 2n

Question

Let A = {1, 2,3,…. n} and B = { a, b}. Then the number of surjections from A into B is

Options :

ⁿP2
2n - 2
2n - 1
None of these

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