Answers

2014-05-28T20:31:13+05:30
10Pr = 5040
10!/(10-r)! = 5040
10*9*8........(10-r)!/(10-r)!=5040
10*9*8.....(10-r+1) = 10*9*8*7
⇒(10-r+1) = 7
⇒11-r=7
⇒11-7 = r
⇒r = 4

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2014-05-28T22:20:16+05:30
10Pr = 5040
10! / (10-r)! = 10! / 6!
10-r = 6
r = 4

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