[" 3.The number of functions "f" from "{...

[" 3.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,k,k,k,k,k,k,k,k,k,k,k,k,k,k,k,k,k,k,k,k,k,k,k,k],[" is a multiple of "4," is "],[[" (a) "(15)!times6!],[" (b) "5^(6)times15],[" (d) "6!times6!],[" (d) "6^(6)times(15)!]]

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