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OpenStudy (help!!!!):
Help me explain the answer!
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OpenStudy (help!!!!):
I understand the formula for combinations n!/(n-r)!r!
OpenStudy (help!!!!):
but how did they get the r: 3 and 4
OpenStudy (thereisnousername):
maybe they subtracted 2 from each? lol I dont really know,
OpenStudy (help!!!!):
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