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OpenStudy (anonymous):
Erik Allen repairs photocopy machines. According to his schedule, he needs to visit 5 different offices today. How many ways can Erik visit these offices and return to his headquarters? A. 120 B. 5 C. 20 D. 24
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OpenStudy (anonymous):
B. 5
OpenStudy (unklerhaukus):
\[5!=5\times4\times3\times2\times2\times1=120=A.\]
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