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12 January, 06:45

How many one-to-one correspondences are there between two sets with 5 elements each?

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  1. 12 January, 06:53
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    1st element can be matched with 5

    2nd element can be matched with 4

    3rd element can be matched with 3

    etc.

    Total number of correspondences = 5*4*3*2*1 = 120
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