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OpenStudy (anonymous):
There are 9 items at the salad bar. How many ways can Gwen select 3 items from the salad bar? A. 3 B. 27 C. 84 D. 504
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OpenStudy (anonymous):
really need to edit these questions
OpenStudy (solomonzelman):
Well, 9 C 3 would be the number of choices.
OpenStudy (anonymous):
what do u mean?
OpenStudy (solomonzelman):
Combinations nCr. Have you ever heard of this ?
OpenStudy (anonymous):
9*8*7 = 504 answer is D
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