A) \[{{\log }_{e}}y\]
B) \[{{\log }_{e}}\frac{1}{y}\]
C) \[{{e}^{y}}\]
D) \[{{e}^{-y}}\]!
Correct Answer: A
Solution :
\[y=1+\frac{x}{1\ !}+\frac{{{x}^{2}}}{2\ !}+\frac{{{x}^{3}}}{3\ !}+......={{e}^{x}}\Rightarrow x={{\log }_{e}}y\].
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