What is the maximum number of triangles that can be formed by plotting $19$ points on three parallel lines?

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by AAPL » Sat Dec 13, 2025 7:52 am

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What is the maximum number of triangles that can be formed by plotting $19$ points on three parallel lines?

A. $300$
B. $416$
C. $540$
D. $642$
E. $894$

OA D

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Source: Beat The GMAT — Problem Solving | Sat Dec 13, 2025 7:52 am

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