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Omni-MATH / Compute sum_substacka+b+c=12 a geq 6, b, c geq 0 fraca!b!c!(a-b-c)! where the sum runs over all triples of nonnegative integers (a,b,c) such that a+b+c=12 and a≥6. · Discussion

Discussing Compute sum_{substack{a+b+c=12 a geq 6, b, c geq 0}} frac{a!}{b!c!(a-b-c)!} where the sum runs over all triples of nonnegative integers (a,b,c) such that a+b+c=12 and a≥6. · Omni-MATH

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