You have been hired to crack a code on a super-secret safe. The
code consists of two letters followed by three numbers. How
many possible secret codes are there if digits and letters can be
repeated in the code?
There is 676,000 possible codes since for each of the letters in the code, there are 26 possibilities, and for each number in the code, there are 10 possibilities. So, it’s 26 squared times 10 cubed, or 676,000
