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Mathematics 13 Online
OpenStudy (anonymous):

how many ways can the runners finsh first, second, and third?

OpenStudy (sandra):

it depends on how many runners

OpenStudy (sandra):

if there are three runners, then 3 runners can finish first, 2 others can finish second, and 1 can finish

OpenStudy (sandra):

so there are six possible comginations

OpenStudy (sandra):

ABC ACB BAC BCA CBA CAB

OpenStudy (sandra):

but the formula is 3 (possible for first) * 2 (possible for second) * 1 (possible for third)

OpenStudy (sandra):

if there are n runners, then the answer is n*n-1*n-2

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