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Prove that (1)/(10!) +(1)/(11!)+(1)/(12!...

Prove that `(1)/(10!) +(1)/(11!)+(1)/(12!)=(145)/(12!).`

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To prove that \[ \frac{1}{10!} + \frac{1}{11!} + \frac{1}{12!} = \frac{145}{12!} \] we will start by simplifying the left-hand side. ...
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