Posted by Anonymous on Friday, June 29, 2012 at 10:02pm.
Andrea Betty Joyce Karen and Paula are starters on their school basketball team . How many different groups of three can be chosen for a photo?

algebra  MathMate, Friday, June 29, 2012 at 10:13pm
If order (in the photo) is not important, then we choose 3 from 5, which is 5C3=5!/(3!2!)=10