Find the unit digit if 1!+2!+3!+4!+5!+6!+7!+8!+9!+10!?
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3
Step-by-step explanation:
(1)+(2×1)+(3×2×1)+(4×3×2×1)+(5×4×3×2×1)+(6×5×4×3×2×1)+(7×6×5×4×3×2×1)+(8×7×6×5×4×3×2×1)+(9×8×7×6×5×4×3×2×1)+(10×9×8×7×6×5×4×3×2×1)
1+2+6+24+120+720+5040+40320+362,880+3628800
4,037,913
3 is unit digit
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