Question

10pn+1:11pn=30:11 find n value using permutations​

Answer 1

Step-by-step explanation:

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{ 10! / ( 11 - n )! } / { 11! / (13 - n)! }

=> { 10! / 11! } * { (13-n) (12-n) } = 30/11

=> 1/11 * { (13-n) (12-n) } = 30/11

=> (13-n) (12-n) = 30

NOTE: (13 - n) and ( 12 - n) are consecutive terms...

Therefore,  (13-n) (12-n) = 6 * 5 or (-6) * (-5)

=> n = 13 - 6 or 12 - (-6)

=> n = 7 or 18

Well, you can use Quadratics of you want......... Hope you're satisfied..