SATHEE: Permutations And Combinations Question 222

Permutations And Combinations Question 222

Question: 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 of the form $ a!\times b! $ then $ a\times b $ is

Solution:

Answer: 90

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Permutations And Combinations Question 222

Question: 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 of the form $ a!\times b! $ then $ a\times b $ is

Solution:

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