Question

How many numbers between `1` and `100` are not divisible by `2` or `5`?

Difficulty level (1 very easy - 10 very hard): 2

Arithmetic Number Theory -> Modular Arithmetic / Remainder Arithmetic -> Divisibility Rules -> Divisibility Rules by 2, 4, and 8 Number Theory -> Modular Arithmetic / Remainder Arithmetic -> Divisibility Rules -> Divisibility Rules by 5 and 25 Number Theory -> Greatest Common Divisor (GCD) and Least Common Multiple (LCM) Set Theory Number Theory -> Division

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