Correct Answer: Option C

Explanation

\(e^{x} = 1 + x + \frac{x^{2}}{1.2} + \frac{x^{3}}{1.2.3} + ...\)

\(\frac{1}{e^{\frac{1}{2}}} = e^{-\frac{1}{2}}\)

\(e^{-\frac{1}{2}} = 1 - \frac{x}{2} + \frac{x^{2}}{1.2^{3}} - \frac{x^{3}}{1.2^{4}.3} + ... \)

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