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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