CAT (QA) PYQs

How many integers in the set $(100,101,102, \ldots, 999)$ have at least one digit repeated?

The number of all natural numbers up to $1000$ with non-repeating digits is

A cafeteria offers 5 types of sandwiches. Moreover, for each type of sandwich, a customer can choose one of 4 breads and opt for either small or large sized sandwich. Optionally, the customer may also add up to 2 out of 6 available sauces. The number of different ways in which an order can be placed for a sandwich, is