AN OFFICE SECRETARY TRIES TO DEVICE CODING SCHEME FOR CERTAIN RECORDS, USING DIGITS 1 TO 4. SHE WANTS TO FIND THE TOTAL NUMBER OF CODES OF DIFFERENT DIGITS. IF ONLY THREE OF THE FOUR DIGITS ARE USED
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Expert's answer
2019-09-09T12:45:56-0400
We should choose three digits and order is important for us,
then we can count it as A(4,3)=((4!)/(1!))=24 by the formula of counting permutations without repetition.
Every choice represents some code. The answer is 24.
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