#1**+1 **

3) How many positive integers less than 1000 have at least one digit of 0?

10 *9 + 9 = 99 have an ending digit of 0

9*9 = 81 have a middle digit of 0 [ but not an ending digit of 0 ]

So

99 + 81 = 180 have at least one 0

CPhill May 25, 2019