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Canadian postal codes consists of three letters and three digits, which alternate and start with a letter. For example, M3K 1E8 is a postal code

Canadian postal codes consists of three letters and three digits, which alternate and start with a letter. For example, M3K 1E8 is a postal code in Toronto, Ontario. How many postal codes can be created using this system?

a. Repetition is allowed

b. Repetition is not allowed

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