P(12,r)=p(11,6)+6.p(11,5)
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Hey!!
P(12,r) = P(11,6)+6P(11,5)
=> 12Pr = 11P6 +6×11P5
=> 12!/(12-r)! = 11!/(11-6)! + 6×11!/(11-5)!
=> 12/(12-r)! = 1/5! + 6/6×5!
=> 12/(12-r)! = 2/5!
=> (12-r)! = 6!
=> r = 6
P(12,r) = P(11,6)+6P(11,5)
=> 12Pr = 11P6 +6×11P5
=> 12!/(12-r)! = 11!/(11-6)! + 6×11!/(11-5)!
=> 12/(12-r)! = 1/5! + 6/6×5!
=> 12/(12-r)! = 2/5!
=> (12-r)! = 6!
=> r = 6
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