Question: A security pass-code is either a sequence containing a digit followed by 3 letters or a sequence containing 4 digits followed by a letter. How

A security pass-code is either a sequence containing a digit followed by 3 letters or a sequence containing 4 digits followed by a letter. How many different pass-codes are possible? (Note, a digit or letter may repeat. A digit is 0 - 9, and a letter is A through Z.)

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