14-05-2016
Mathematics

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how many different four-person relay teams can be chosen from eight students

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14-05-2016

slot method

8 optionns n 1st slot
7 options in 2nd slot (since 1 is at 1st slot)
6 options in 3rd slot
5 options in 4th slot

8*7*6*5=1680 ways

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