Question

How many 5-digit numbers contain at least one 3?

Answer 1

37,512

Explanation:

Total # of 5 -digit numbers =9×104=90,000

Total # of 5 -digit numbers that do not contain 3=8×94=52,488

Total # of 5 -digit numbers that contain at least one 3=90,000−52,488=37,512