probability

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elimenda: Junior | Next Rank: 30 Posts; Posts: 19; Joined: Fri Jul 11, 2008 10:26 am

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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Source: Beat The GMAT — Problem Solving | Thu Jul 17, 2008 11:41 pm

reachac: Legendary Member; Posts: 572; Joined: Fri Feb 22, 2008 9:25 am; Thanked: 21 times

by reachac » Fri Jul 18, 2008 12:26 am

IMO D

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

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