Question

A bike lock has a 3 digit combination. Each character can be any digit from 3-8. The only restriction is that all 3 characters cannot be the same (e.G.555,666,777...). How many combinations are possible?

Answer 1

Answer:

The number of possible combinations is 180

Step-by-step explanation:

The numbers to select from are 3-8

These are 6 numbers

Now, the restriction we have is that the 3 characters cannot be the same

For the first character, we have 6 choices;

For the second character, we have another 6 choices

For the last character, since it cannot be the same, we can only have 5 choices

So the possible number of choices will be;

6 * 6 * 5 = 189 combinations