Fundamental Counting Theorem

“A restaurant offers 4 appetizers, 6 main courses, and 3 desserts. If a customer chooses one item from each category, how many different meals can they create? A password must be 4 characters long. The first character must be a letter (A-Z), and the remaining 3 characters must be digits (0-9). How many different passwords are possible? You are creating a code using 2 letters followed by 2 numbers. There are 5 possible letters and 3 possible numbers. How many different codes can you create?”