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License plates: In a certain state, license plates consist of four digits from 0 to 9
followed by three letters. Assume the numbers and letters are chosen at random. Replicates are
allowed.

1. How many different license plates can be formed?

2. How many different license plates have the letters S-A-M in that order?

3. If your name is Sam, what is the probability that your name is on your license plate?