A keycode must contain 2 letters and 3 numbers. The letters may be any letter of the alphabet. The numbers should be any number from 0 to 9. How many different keycode combinations are there?
Hi! So what you need to know about combinations is that you can multiply possible events to get the combinations of all events. For example, if the combination was just two numbers 1-9, we know that each "slot" of the combination has 9 possibilities, so we can do 9*9, for a total of 81 possible combinations. Does that help? If not I can explain further.
