1×2×3×4+2×3×4×5+……+n(n+1)(n+2)(n+3)=?
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1×2×3×4+2×3×4×5+……+n(n+1)(n+2)(n+3)=?
1×2×3×4+2×3×4×5+……+n(n+1)(n+2)(n+3)=?
1×2×3×4+2×3×4×5+……+n(n+1)(n+2)(n+3)=?
1x2x3x4+2x3x4x5+.+n(n+1)(n+2)(n+3)=1\3n(n+1)(n+2)(n+3)(n+4)
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