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  3. Number of triangles that can be formed joining the angular points of decagon is

. Number of triangles that can be formed joining the angular points of decagon is

A. 30

B. 20

C. 90

D. 120

Best Answer

Ans: D

Sol: Total number of points in a decagon = 10, so number of triangles formed joining these 10 points = 10C3 = 120

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