An identification code is to consist of three letters followed by four digits, homework help

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Mathematics

Description

Letter codes

An identification code is to consist of three letters followed by four digits. How many different codes are possible if the first letter must be an A, B, C, or D and repetition is not permitted?


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Explanation & Answer

The code consists of three letters and four digits. So there are 7 places that we have to fill.1st pla...


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