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OpenStudy (anonymous):
Which of the following expressions would give the number of ways to choose a group of 7 from a group of 15? a.7!/15!7 b.7!/15!8! c. 15!/7!8!
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hartnn (hartnn):
its 15C7 which is 15!/7!8!
OpenStudy (anonymous):
is it because 7+8=15?
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