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OpenStudy (anonymous):
How many ways can you arrange the last four digits of a phone number if at least one digit repeats?
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OpenStudy (anonymous):
look at how many ways can you arrange in total and how many ways none of the digits repeat. the difference of the 2 number is your answer
OpenStudy (anonymous):
excellent thanks!!!!! I'll try it :)
OpenStudy (anonymous):
got it! thanks...was stuck on this one awhile :)))
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