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I have the following equation:

[tex]f(x)=\sum_{r=m}^{M_B}\,\sum_{i=0}^{M_B-r}\,\sum_{j=0}^{r+i}\,\sum_{k=0}^{j(N_B-1)}(-1)^{i+j}{M_B\choose r}{M_B-r\choose i}{r+i\choose j}\left(\frac{x}{C}\right)^k\,e^{jx/C}[/tex]

and I want to write it in the form of [tex]f(x)=1+R(x)[/tex]

[tex]m[/tex] will be any number from 1 up to [tex]M_B[/tex], and [tex]f(x)=1-e^{x/C}[/tex] for [tex]M_B=N_B=1[/tex].

Can anyone help me, please? Because I am not sure about the limits when extracting some values of them.

Regards

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# Re-write the Equation

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