Simple math question! Help

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1

<p>So this is simple enough but I don't understand how CB got this:</p>

<p>How do you simplify n/n-1 * 1/n * n/n+1? CB got n/(n-1)(n+1).</p>

<p>BTW this isn't the whole problem but I understand the problem except for that little point. I just need a quick help. Thanks</p>

2

<p>n/n-1 * 1/n * n/n+1
(n * n* 1)/(n(n-1)(n+1))
n^2/(n(n-1)(n+1))
simplify by factoring our or canceling a single n
n/(n-1)(n+1)</p>