06-10-2016
Mathematics

contestada

P(n,2) =42

n=?

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Respuesta :

alex1206 alex1206

06-10-2016

P(n,2)=42, find n.
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n!/(n-2)! = 42
n(n-1) = 42
n^2 -n - 42 = 0

(n-7)(n+6) = 0
Positive answer:
n = 7
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Cheers,

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