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Functions question

2019 · 11 Jan · Shift 2 · Q36
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  5. /2019 · 11 Jan · Shift 2 · Q36

Functions question

2019 · 11 Jan · Shift 2 · Q36

JEE MainMathematicsFunctionsMCQ+4 / −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 :
  1. A
    65 ×\times× (15)!
  2. B
    56 ×\times× 15
  3. C
    (15)! ×\times× 6!
  4. D
    5! ×\times× 6!
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