Question

How many 3 digit numbers are there such that at least one of their digit is 6 ?

Answer 1

Hence, the number of 3 digit even numbers that contain at-least one 7 is450 − 360 = 90 . The final (units) digit is even, and there are five choices for that independent of whatever else happens - so the answer must be divisible by five. There are even numbers with three digits