There are 2 parallel line segments AB and CD in a plane. AB contains 12 marked points whereas CD contains 8 marked...

GMAT Paper Tests

There are 2 parallel line segments AB and CD in a plane. AB contains 12 marked points whereas CD contains 8 marked points. How many triangles can be formed by using these marked points as vertices?

A. $(12!\cdot 28)+(8!\cdot 66)$
B. $12!\cdot 8$
C. $^{20}C_3$
D. $864$
E. $1024$

OA D

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