If \[y=1+\frac{x}{1\,!}+\frac{{{x}^{2}}}{2\,!}+\frac{{{x}^{3}}}{3\,!}+......\infty \], then \[x=\]

If \[y=1+\frac{x}{1\,!}+\frac{{{x}^{2}}}{2\,!}+\frac{{{x}^{3}}}{3\

1.	If \[y=1+\frac{x}{1\,!}+\frac{{{x}^{2}}}{2\,!}+\frac{{{x}^{3}}}{3\,!}+......\infty \], then \[x=\]
A.	\[{{\log }_{e}}y\]
B.	\[{{\log }_{e}}\frac{1}{y}\]
C.	\[{{e}^{y}}\]
D.	\[{{e}^{-y}}\]!
Answer» B. \[{{\log }_{e}}\frac{1}{y}\]

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If \[y=1+\frac{x}{1\,!}+\frac{{{x}^{2}}}{2\,!}+\frac{{{x}^{3}}}{3\,!}+......\infty \], then \[x=\]

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