How to find numbers divisible by 3 between 200 and 400 without testing every number in the range? And explain the solution to a 10 year old!
2026-03-25 22:03:47.1774476227
How t0 find numbers divisible by 3 between 200 and 400 without testing every number in the range?
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a) Find the first one. $200/3 = 66 \text{ r } 2$, so the first one is $201 = 67\times 3$.
b) Find the last one. $400/3 = 133 \text{ r } 1$, so the last one is $399 = 133\times 3$.
c) Find how many integers are in the range $[67..133]$ inclusive.