Binomials!

Probability Level 3

j=lmC(j,l) \large \sum_{j=l}^m C(j,l)

Let C(j,l)C(j,l) denote the binomial coefficient, j!l!(jl)!\frac{j!}{l!(j-l)!} . For integers ml0m\geq l \geq 0 , what is the value of the summation above?

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