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Multiplication

Calculus Level 3

The value of the product \[\left(1 + \dfrac{1}{1!} + \dfrac{1}{2!} + \cdots\right) \left(1 - \dfrac{1}{1!} + \dfrac{1}{2!} -\dfrac{1}{3!} + \cdots\right)\] is

0 1 \[\ln 2\] \[e^2\]

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by Ravneet Singh

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