California automobile license plates used to have 3 numbers followed by 3 letters. They were changed to have a number (1 or 2) followed by 3 letters (A to Z) followed by 3 numbers (0 to 9). a)  Howmanydifferentplateswerepossiblewith3numbersfollowedby3lettersifrepetition were allowed? b)  Howmanydifferentplatesarepossiblewithaleaddigitof1or2followedby3lettersand then 3 numbers if repetition are allowed?

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