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6 February, 16:42

In how many ways can you arrange 3 out of 5 books (a, b, c, d, and

e. on a shelf, if the order of each arrangement matters (so abc is different from cba) ?

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  1. 6 February, 16:57
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    Yes bro ...

    the easiest way is to use 5C3

    = 5! / (5-3) !3!

    = 5 (5-1) (5-2) (5-3) ! / (5-3) !3!

    = 5*4*3*2/3*2

    = 5*4 = 20ways
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