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How many positive integers less than 2020 aren’t divisible by 2, 3, 5, or 7?

 May 24, 2022
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If you remove all the multiples of 2, 3, 5 and 7 and double counting, you should get:

 

461 integers, between 1 and 2020,  that are NOT divisible by 2, or by 3, or by 5, or by 7.

 May 24, 2022

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