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OpenStudy (anonymous):
MEADAL!! How many combinations of 4 students can a teacher choose from 30 students? A. 657,720 B. 27,405 C. 120 D. 810,000
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OpenStudy (compassionate):
The answer is 30C4 = 30*29*28*27/(4*3*2*1) = 27,405
OpenStudy (anonymous):
Oh Yeah I guess I forgot! Thx
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