Question

Your bicycle has a 4-digit combination lock. you forgot your combination but you do know that your lock uses 4 different numbers. if each digit on your lock has a number from 0 to 9, how many lock codes are possible?

Answer 1

There are 10,000 possible lock codes.

Each digit on the lock can be any number from 0 to 9. Since the lock uses 4 different numbers, there are 10 choices for each digit. This gives us 10 x 10 x 10 x 10 = 10,000 possible combinations.

For example, some possible combinations are 0123, 4567, 8901, and 9876.

Note that the order of the digits matters. So, 1234 is a different combination from 4321.

Explanation: