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ten runners joine a race .in how many possible ways can they be arranged as first devond and third placers?
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Feb 9, 2017
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ten runners joine a race .in how many possible ways can they be arranged as first devond and third placers?
Mathematics
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10P3 -> 10!/7!
=720
OR
There are ten possible runners for first place, then nine for second place, and eight for third place, therefore:
10*9*8 = 720
Sunghee Yun
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Feb 16, 2017
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Sunghee Yun
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