12Pr=1320 find 'r'

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3 Answers

12pr=1320 . . . r=1320/12p . . . r=110/p
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r=3, as 12pr=1320 12p3=12!/(12-3)!=12!/9! 12p3 =12*11*10=1320
by
Given 12pr=1230 12!/(12-r)! 1230 12pr=12.11.10 12p3 So r=3
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