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Topic: Is this identity true, false, or obvious and easy to prove?
Replies: 3   Last Post: Jan 6, 2012 3:43 AM

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Lido

Posts: 2
From: LA
Registered: 1/5/12
Is this identity true, false, or obvious and easy to prove?
Posted: Jan 5, 2012 3:43 AM
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n! - (n - 1)! = (n - 1)(n - 1)!



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