exam Maths Puzzle Numerical Ability

Angela's math test had 100 multiple-choice questions. Each correct answer was worth 1 point, each incorrect answer was worth -2 points, and skipped questions were worth 0 points. A

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1. At a campus club meeting, there are 6 seniors, 4 juniors and 3 sophmores. If a committee of 4 students is selected at random, find the probability that it will consist of 2 seniors, 1 junior, and 1 sophmore.
 Please help me set up the last section I amjust not sure.


This problem set involves a formula (a rational function) with which a new tortilla company might be able to forecas