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Approximate:

$$\sum _{ n=0 }^{ \infty }{ \cfrac { ( -1 ) ^{ n } }{ { n }! } } $$

...using the first 4 terms.

A

$\cfrac{2}{3}$

B

$\cfrac{1}{3}$

C

$-\cfrac{1}{3}$

D

$-\cfrac{2}{3}$

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