ABCD is a convex quadrilateral and 3, 4,...

ABCD is a convex quadrilateral and 3, 4, 5, and 6 points are marked on the sides AB, BC, CD, and DA, respectively. The number of triangles with vertices on different sides is a. `270` b. `220` c. `282` d. `342`

A

215

B

342

C

225

D

424

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