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

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