The number of functions f from {1,2,3,....,20} onto {1,2,3,...,20} suc – InterviewSolution

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 :
Answer» 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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