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OpenStudy (anonymous):
in how many ways can 3 boooks be selected from a shelf of 25 books?
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OpenStudy (anonymous):
click good answer
OpenStudy (anonymous):
2300 ways
OpenStudy (campbell_st):
25C3
OpenStudy (anonymous):
25!/3!(25-3)!=25!/3!22!=25*24*23/3!=25*24*23/6=25*4*23=100*23=2300
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