Find the units digit of the following addition is ....1!+2!+3!+4!+......999!
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unit digit in 1! is 1
in 2! is 2
in 3! is 6
in 4! is 4
after that it's zero.
hence unit digit of addition would be unit digit of 1+2+6+4+0
i.e. 3
in 2! is 2
in 3! is 6
in 4! is 4
after that it's zero.
hence unit digit of addition would be unit digit of 1+2+6+4+0
i.e. 3
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