Question

A reaa realtor uses a lock box to store the keys to a house that is for sale the access code for the lock box since it consists of five digits the first digit cannot be at 8 and the last digit

Answer 1

Using the multiplication principle we have:

(9)(10)(10)(10)(5)

In the first digit we have 9 options as it cannot be 8.

In the second, third and fourth digits we have 10 options.

In the last digit we have to take into account the odd digits, which are 5.

Multiplying the numbers, we have:

45000

The answer is 45000 codes.