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OpenStudy (2bornot2b):
What is the digit at the unit's place of 1!+2!+3!+........99!
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OpenStudy (mertsj):
5
OpenStudy (anonymous):
apparently it is 3, but i have no idea why
OpenStudy (anonymous):
It's 3 because 5! is 120 and anything greater than that has a unit digit of 0 so all you have to do is 1! + 2! + 3! + 4! which is 33 so the answer is 3.
OpenStudy (anonymous):
oh maybe i do, because after 5! you will get nothing in the 1's place
OpenStudy (anonymous):
right! what supermarth said
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OpenStudy (mertsj):
Oh wow!! how clever
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