Friend of 3, Foe of 5.

How many numbers from 1 to 100 are multiples of 3 but not 5?


The answer is 27.

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1 solution

From 1 to 100, there are 33 numbers which are divisible by 3. From 1 to 100, there are 6 numbers which are divisible both by 3 and 5. According to the question, the numbers are to be divisible by 3 and not by 5. So, the answer is 33-6=27.

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