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प्रश्न
How many triangles can be formed by joining the vertices of a hexagon?
संख्यात्मक
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उत्तर
A hexagon has six vertices. By joining any three vertices of a hexagon we get a triangle.
∴ Number of triangles formed by joining the vertices of a hexagon = 6C3 = `(6xx5xx4)/(3xx2xx1)` = 20
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