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I have the following equation, which is simply the multinomial exapnsion:

[tex]\left[\sum_{l=1}^L\,x_l\right]^n=\sum_{k_1,k_2,\ldots,k_L}{n\choose k_1,k_2,\ldots,k_L}\prod_{l=1}^L\,x_l^{k_l}[/tex]

where the summation is taken over all possibilities that the summation of the nonnegative integer indices k1,k2,...,kL equal n.

How can I program this using Mathematica??

Thanks in advance

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# Multinomial Expansion in Mathematica

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