The number of three digit numbers in which 9 appears only in one place is

Step-by-step solution

The number of three digit numbers in which 9 appears at hun dred place only is = 1 × 9 × 9 = 81 Similarly, the number of three digit numbers in which 9 appears at ten or unit place only is = (8 × 1 × 9) × 2 = 144