Question: Need help answering questions: How many three-letter codes can be made from 10 letters FGHIJKLMNO if repetition of letters (a) is allowed? There are possible

Need help answering questions:

How many three-letter "codes" can be made from 10 letters "FGHIJKLMNO" if repetition of letters (a) is allowed? There are possible three-letter "codes". (b) is not allowed? There are possible three-letter "codes&quot

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