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15-08-2017
Mathematics

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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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apologiabiology apologiabiology

15-08-2017

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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