Yet another sum problem

Problem #270

Yet another sum problem

Let S = ${\sum_{j=0}^{p}} ^{p}C_j * ^{(p+j)}C_j * 3^j$ .

Calculate S mod $p^2$ for $p = 10^9 + 7$

combinatorics

Contributed by Kalptaru Agarwal

Solved by 8 users

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