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Of the 9 students on Lincoln High School’s Debate Team, 4 will be chosen to represent the school at Regionals. How many different groupings could be chosen?

 Jun 8, 2017
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it is not a ratio. it is a combination, written ncr. The math for it is n!/((n-r)!*r!) or in your case, 9!/(5!*4!) 

this comes out to be 126. I hope this is helps.

 Jun 8, 2017
edited by Guest  Jun 8, 2017

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