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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A

B

C

D

E

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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
Source: — Problem Solving |