Sum of multiples of 3 or 5
What is the sum of all integers from 1 to 100 that are divisible by 3 or by 5?
Show hints (2)+
- Inclusion–exclusion: add multiples of 3 and of 5, then subtract the overlap.
- The overlap is multiples of , not .
Answer
Reveal answer →Final answer
2418
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Asked at: Timed Mental-Math & Sequences, Game-Based Aptitude