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How many triangles can be drawn by joining the vertices of a decagon ?

Answer»

Solution :A decagon has 10 VERTICES and 3 non- collinear points are required to be a triangle.
`:. "The number of triangles formed by the joining the vertices of a decagon is """^10C_3=(10!)/(3!7!)= (10*9*8)/(3*2*1)=120`


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