The number of functions f from {1, 2, 3, …, 20} onto {1, 2, 3, …, – McqOptions

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1.	The number of functions f from {1, 2, 3, …, 20} onto {1, 2, 3, …, 20} such that f(k) is a multiple of 3, whenever k is a multiple of 4, is:
A.	65 × (15)!
B.	5! × 6!
C.	(15)! × 6!
D.	56 × 15
Answer» D. 56 × 15

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