VeBen
VeBen VeBen
  • 06-10-2016
  • Mathematics
contestada

P(n,2) =42

n=?


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Respuesta :

alex1206
alex1206 alex1206
  • 06-10-2016
P(n,2)=42, find n.
------------
n!/(n-2)! = 42 
n(n-1) = 42
n^2 -n - 42 = 0

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