How many onto (or surjective) functions are there from an n-element (n >= 2) set to a 2-element set?

How many onto (or surjective) functions are there from an n-element (n

1.	How many onto (or surjective) functions are there from an n-element (n >= 2) set to a 2-element set?
A.	2n
B.	2n - 1
C.	2n - 2
D.	2(2n - 2
Answer» D. 2(2n - 2

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How many onto (or surjective) functions are there from an n-element (n >= 2) set to a 2-element set?

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