JEE Math Practice Question
The sum of the series $$1 + {1 \over {4.2!}} + {1 \over {16.4!}} + {1 \over {64.6!}} + .......$$ ad inf. is
- A.$${{e - 1} \over {\sqrt e }}\,$$
- B.$${{e + 1} \over {\sqrt e }}$$
- C.$${{e - 1} \over {2\sqrt e }}$$
- D.$${{e + 1} \over {2\sqrt e }}$$
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