If Line $A$ and Line $B$ are parallel to each other and $7$ points are marked on Line $A$ and $9$ points are

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Vincen: Legendary Member; Posts: 2898; Joined: Thu Sep 07, 2017 2:49 pmFollowed by: 5 members; Thanked: 6 times

by Vincen » Tue Jan 05, 2021 10:42 am

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If Line $A$ and Line $B$ are parallel to each other and $7$ points are marked on Line $A$ and $9$ points are marked on Line $B,$ how many triangles can be formed whose vertices are among those marked points?

A. 63
B. 189
C. 252
D. 324
E. 441

Answer: E

Source: e-GMAT

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Source: Beat The GMAT — Problem Solving | Tue Jan 05, 2021 10:42 am

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