Question

A person is asked to say a three digit number.
(i). What is the probability that all the three digits of this number are the same ?

Hint:

To find the total number of n-digit numbers, you can think about the choices for each digit. For a 3-digit number, the first digit can be any from 1-9 (9 choices), and the second and third can be any from 0-9 (10 choices each). Total = 9 × 10 × 10 = 900. This is a reliable method.

Answer 1