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22 February, 11:09

Ten runners joine a race. in how many possible ways can they be arranged as first devond and third placers?

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  1. 22 February, 11:35
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    10P3 - > 10!/7!

    =720

    OR

    There are ten possible runners for first place, then nine for second place, and eight for third place, therefore:

    10*9*8 = 720
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