ReplaceAll[Mod[Sum[Binomial[n, k] (-3)^k, {k, 1, n}], 3^10], {n -> 4 3^9}]ReplaceAll[Mod[Sum[Binomial[n, k] (-3)^k, {k, 1, n}], 3^10], {n -> 4 3^9}]

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