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JEE Main & Advanced Mathematics Permutations and Combinations Question Bank Numerical Value Type Questions - Permutations and Combinations

  • question_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 of the form \[a!\times b!\] then \[a\times b\] is

    Answer:

    90


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