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how many ways can the runners finsh first, second, and third?
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it depends on how many runners
if there are three runners, then 3 runners can finish first, 2 others can finish second, and 1 can finish
so there are six possible comginations
ABC ACB BAC BCA CBA CAB
but the formula is 3 (possible for first) * 2 (possible for second) * 1 (possible for third)
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if there are n runners, then the answer is n*n-1*n-2
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