Specify whether you are including the numbers between 0000 and 1000.
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-2
Multiple of both 2 and 3 <=> multiple of 6 So require 2 digit multiples of 6. 2*6 = 12 and 16*6=96 So the answer is 16-2+1 = 15
17
The number is 42.
It would help to know which digit. 0 appears in 9 numbers and each of the others in 18 numbers.