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Mathematics 55 Online
OpenStudy (anonymous):

A code word is either a sequence of three letters followed by two digits or two letters followed by three digits. (Unless otherwise indicated, letters will means letters cho- sen from the usual 26-letter alphabet and digits are selected from f0; 1; 2; 3; : : : ; 8; 9g. Also, unless it is stated that letters have to be di erent, you should assume repeats are allowed. Likewise for digits.) How many di erent code words are possible?

OpenStudy (anonymous):

Is it (26*26*10*10*10) + (26*26*26*10*10)

OpenStudy (anonymous):

Yep, looks right.

OpenStudy (ash2326):

Yeah you're correct

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