abeigailshelton528 abeigailshelton528

02-02-2018
Mathematics

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How many three-letter "words" can be made from 9 letters "fghijklmn" if repetition of letters (a) is allowed?

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arthurzhang2006 arthurzhang2006

02-02-2018

729. You just do 9 to the power of 3 or 9^3 and you will get 729. If it is not allowed, the answer is 504.(9 x 8 x 7)

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