Addition Problem!
Level
2
Sounds as easy as it is. Find the sum of all the positive integers less than 700 that are not multiples of 7.
-NCML
The answer is 210000.
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1 solution
It can be solved as the sum of +ve integers less than 700 that are not multiple of 7 = [ (sum of +ve integers up to 699) - (sum of an A.P. containing +ve integers less than 700 that are multiple of 7).