#1**+2 **

Best Answer

Notice that after 5! every number will end in 0. So, we are just looking for 1!+2!+3!+4! which ends in a 3.

tertre Dec 14, 2018

#2**0 **

In 5! and up, there is a 2 and a 5, and when multiplied, they equal 10, which has a 0 in the units digit.

PartialMathematician
Dec 15, 2018