Question 0501a

Sigma Notation
Method of Differences I

Question

Find, in terms of n,{n,}
r=1n(1(r1)!1r!).\sum_{r=1}^n \Big( \frac{1}{(r-1)!} - \frac{1}{r!} \Big).

Attempt

The answer is of the form
where a={a=}

Answer

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