defence exam Army Havildar SAC Mock Test Series 2025 Mathematics Sequences and Series Special Series

Find the value of \( \rm 1- \dfrac{1}{1!}+ \dfrac{1}{2!}- \dfrac{1}{3!}+ \dfrac{1}{4!}- .....\)

1
e
2
2e
3
\(\rm \frac 1 e\)
4
e2
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