The number of onto functions (surjective functions) from set X = {1, 2

1.	The number of onto functions (surjective functions) from set X = {1, 2, 3, 4} to set Y = {a, b, c} is
A.	36
B.	64
C.	81
D.	72
Answer» B. 64

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The number of onto functions (surjective functions) from set X = {1, 2, 3, 4} to set Y = {a, b, c} is

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