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Can every body solve this problem in terms of [itex] a [/itex] and [itex] b [/itex].

[itex]e^{-(a+b)}\sum _{n=0}^{\infty} \frac{a^n}{n!} \sum_{m=0}^{n}\frac{b^m}{m!}[/itex]

Thanks in advance for your participation.

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# Calculating a double summation

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