Question

The sum of series $\frac{1}{2!} - \frac{1}{3!} + \frac{1}{4!} - .............$ upto infinity is
$(a) e^{-\frac{1}{2}}\\(b) e^{+\frac{1}{2}}\\(c) e^{-2}\\(d) e^{-1}$

Answer 1

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