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[" The number of functions from "{1,2,3,...

[" The number of functions from "{1,2,3,....,20}," onto "{1,2,3,.....20}" such that "f(k)" is a multiple of "3,],[" wherever "k" is a multiple of "4," is : ":],[[" (1) "5!times6!," (2) "(15)!times6!," (3) "6^(5)times(15)!," (4) "5^(6)times15]]

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