\[\int\limits_{0}^{\infty }{\left[ \frac{2}{{{e}^{x}}} \right]}\,dx\] is equal to ([x] = greatest integer \[\le \] x)

\[\int\limits_{0}^{\infty }{\left[ \frac{2}{{{e}^{x}}} \right]}\,dx\]

1.	\[\int\limits_{0}^{\infty }{\left[ \frac{2}{{{e}^{x}}} \right]}\,dx\] is equal to ([x] = greatest integer \[\le \] x)
A.	\[{{\log }_{e}}2\]
B.	\[{{e}^{2}}\]
C.	0
D.	\[\frac{2}{e}\]
Answer» B. \[{{e}^{2}}\]

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\[\int\limits_{0}^{\infty }{\left[ \frac{2}{{{e}^{x}}} \right]}\,dx\] is equal to ([x] = greatest integer \[\le \] x)

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