( 1×2×3×4×5×6×7×8×9×10)+( 1×2×3×4×5×6×7×8×9 )=3628800+362880=3991680
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( 1×2×3×4×5×6×7×8×9×10)+( 1×2×3×4×5×6×7×8×9 )=3628800+362880=3991680