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@abuiles
Created September 2, 2009 01:39
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(n + 1) × (n + 1)! + (n + 1)! − 1
...
= (n + 1)! × ((n + 1) + 1) − 1 ( Como llegan aqui ?... se sabe que (n+1)! = n! (n+1) )
.....
=
(n + 2)! − 1
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