a+b+c+d=k
a,b,c,d>=1
can you find a formula for the number of integer solutions as a function of k?

a+b+c+d=k
a,b,c,d>=1
can you find a formula for the number of integer solutions as a function of k?

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It looks like repeated choose operation.

\[\binom{k-1}{3}\]

how did u get that so fast lol

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