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30 July, 23:22

How many ways can you arrange the letters in the word prime?

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  1. 30 July, 23:35
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    There are 5 letters in the word "prime"

    Imagine we had 5 slots to fill. They are empty initially.

    Slot 1 has 5 choices to pick from

    Once we pick a letter, we have 4 choices left over for slot 2

    Slot 3 will have 3 choices

    Slot 4 will have 2 choices

    Slot 5 will have 1 choice

    We have this countdown: 5,4,3,2,1

    which multiplies out to 5*4*3*2*1 = 120

    There are 120 unique ways to arrange the letters. Order matters. Because order matters, this is a permutation.
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