JEE Math Practice Question
The sum of series $${1 \over {2!}} - {1 \over {3!}} + {1 \over {4!}} - .......$$ upto infinity is
- A.$${e^{ - {1 \over 2}}}$$
- B.$${e^{ + {1 \over 2}}}$$
- C.$${e^{ - 2}}$$
- D.$${e^{ - 1}}$$
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