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\[1+\frac{1+2}{1\,!}+\frac{1+2+3}{2\,!}+\frac{1+2+...
1.
\[1+\frac{1+2}{1\,!}+\frac{1+2+3}{2\,!}+\frac{1+2+3+4}{3\,!}+....\infty =\]
A.
0
B.
1
C.
\[\frac{7e}{2}\]
D.
\[2\,e\]
Answer» D. \[2\,e\]
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