How many three-letter “words” can be made from the four letters “WXYZ” if
a) repetition of letters is allowed?
b) repetition of letters is not allowed?
Now, use your answers to parts (a) and (b) to answer the following question:
c) What percent of the three-letter “words” that can be made from the four letters “WXYZ” have no repeated letters? Round your answer to the nearest tenth of a percent, if necessary.
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