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9 June, 17:21

In a race in which 7 automobiles are entered and there are no ties, in how many ways can the first three finishers come in

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  1. 9 June, 17:43
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    There are 3 slots

    7 autos for 1st slot

    6 for 2nd (1 went to 1st slot)

    5 for 3rd

    so there are 7*6*5 or 210 ways
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