30
33
35
15
Correct answer is A
6Pr = 6 Thus r = 1 N.B 6P1 = 6!(6 - 1)! = 6!5! = 6×5!5! = 6 6Pr + 1 = 6P2 = 6!(6−2)!=6!4! = 6×5×4!4! = 30
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