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8 December, 07:29

How many permutations exist of the letters a, b, c, d taken three at a time? a. 24 b. 12 c. 4

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  1. 8 December, 09:01
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    4P3 = 24

    In a permutation order matters.

    You can also think about it in this way; you have 3 spots to fill,

    the first spot you have 4 items to choose from. Now there are only 3 items left to choose for the next spot. There are only 2 items left for the third spot, so

    4 * 3 * 2 = 24

    Letter A
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