Posted by Demie on Sunday, May 27, 2012 at 9:57pm.
A student is asked to answer 7 out of 11 questions on an exam.
In how many ways can she select the questions to be answered?

ALGEBRA  MathMate, Monday, May 28, 2012 at 7:20am
11 choose 7 = 11!/(7!4!)
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