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Junior | Next Rank: 30 Posts
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probability

by elimenda » Thu Jul 17, 2008 11:41 pm
Five points lie on a straight line and another 4 points lie on another straight line that is parallel to the first one, how many different triangles can be made by linking these 9 points?

7
20
70
140
400
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by reachac » Fri Jul 18, 2008 12:26 am
IMO D

5*(4C2) + 4*(5C2) = 70
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