Question

suppose you just bought a 3-digit bike lock. if the first digit is not allowed to be 0, but the others can be any of the 10 digits, how many different lock combinations are there?

Answer 1

Answer: 900 different combination locks

Explanation:

this situation relies on permutations.

3 events ordered together each with known outcomes.

9 ways * 10 ways * 10 ways = 900