Question

How many 3 digits number are there suh that at least one of thier digits?

Answer 1

Step-by-step explanation:

If unit place is 9, hundredth place would have 9 options (1 to 9), tens place would have 10 options (0 to 9). Total way 90.

When 9 is fixed for tens place ,unit place choices= 9 (0 to 8), hundredth place choices= 9 (1 to 9). Total = 81.

When 9 is fixed for hundredth place, unit place choices=9, tens place choices=0

Total 81

Answer= 90+81+81=252

May this b helpful to u mate!!

If any other answer is better than me i would be greatful to learn...!!...