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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