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

The number of functions f from \1, 2, 3, …, 20\ onto \1, 2,… — JEE Main 2019 Mathematics PYQ

JEE Main 2019 · 11 Jan · Shift II

The number of functions

f

from

\{1, 2, 3, \ldots, 20\}

onto

\{1, 2, 3, \ldots, 20\}

such that

f(k)

is a multiple of 3, whenever

k

is a multiple of 4, is

Show answer

Correct option: A

[JEE Main 2019 · 11 Jan · Shift II]

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