There are 49 3-digit numbers - from 108 to 990 inclusive.
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No number between 49 and 95 is a multiple of 69 and 18. 69 is a multiple of itself. 54, 72 and 90 are multiples of 18. So no number within that range are multiples of both.
7 (has no multiples)
6
All multiples of 36 are multiples of 18.
The first six multiples of 6 are: 6, 12, 18, 24, 30, and 36.