Question

Consider all the numbers from 1 to 4242. Find the difference between the number of odd numbers divisible by 3
and the number of numbers divisible by 7 in this range.

Difficulty level (1 very easy - 10 very hard): 3

Number Theory -> Modular Arithmetic / Remainder Arithmetic -> Divisibility Rules Arithmetic -> Fractions Number Theory -> Division

Sources:

Young Mathematician Olympiad, 2017-2018, Stage A, Grades 5-6 Question 5

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