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[" The number of functions "f" from "{1,...

[" The number of functions "f" from "{1,2,3,....20;" onto "{1,],[" 2."3,....20;" such that "f(x)" is a multiple of "3" ,whenever "k],[" is a multiple of "4" is "],[[" (a) "6^(5)times(15)!," (b) "(15)!times6!],[" (c) "5^(6)times15," (d) "5!times6!" (Januan "2019)]]

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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:

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