The company has agreed on an 8 character password format, comprised of upper case letters , lower case letters, and digits (0-9). Find the number of passwords possible where the first 2 characters have to be upper case letters, the next 5 can be lower case letters or digits , and the last character has to be an upper case letter. Here are the restrictions:
a. Repetitions are allowed
b. Repetitions are not allowed
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