ten runners joine a race .in how many possible ways can they be arranged as first devond and third placers?

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10-11-2016
Mathematics

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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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ktsubs ktsubs · Answer 1 · 2016-11-10T11:56:43+01:00

ktsubs ktsubs

10-11-2016

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

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