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OpenStudy (anonymous):
How many 3-letter codes are possible using the first 7 letters of the alphabet if letters can be repeated?
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OpenStudy (anonymous):
You have 3 "slots" into which you can put letters. In each slot you can put 7 letters. Therefore there are: \[7 * 7 * 7 = 7^3 = 343 \textrm{ 3-letter codes}\]
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