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3 slots 1st slot has 10 possible people 2nd slot has 9 possible people (1 less than previous) 3rd slot has 8 possible people so there are 10*9*8 ways or 720 ways
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3 slots 1st slot has 10 possible people 2nd slot has 9 possible people (1 less than previous) 3rd slot has 8 possible people so there are 10*9*8 ways or 720 ways