Question

{1, 2, 3, ..., 200}

How many numbers in the above set are divisible by 11 but not by 22?

Answer 1

23 200

Explanation:

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Answer 2

9

Explanation:

My reasoning is that there are 18 numbers divisible by eleven between 1 and 200 (multiples of 11). 22 has only 9 multiples between 1-200, and since only half overlap (share a multiple) only 9 remain (these include 11, 33, 55, ect)