Units Digit
Algebra
Level
2
Find the units digit of 2011! + 2012! + 2013! + 2014! + 2015!.
The answer is 0.
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1 solution
All the numbers i.e. 2 0 1 1 ! , 2 0 1 2 ! , 2 0 1 3 ! , 2 0 1 4 ! a n d 2 0 1 5 ! have at least one multiple of 10 in them. Therefore, the last digit of each of them will be 0. And sum of numbers with 0 as their unit digit will also have 0 as its unit digit...Cheers!!:)