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Nitella [24]
3 years ago
8

How many triangles and quadrilaterals altogether can be formed using the vertices of a 7-sided regular polygon?A. 35B. 40C. 50D.

65E. 70
Mathematics
1 answer:
kondaur [170]3 years ago
7 0

Answer:

E) 70

Step-by-step explanation:

Using combination factorial

a triangle has three vertices and a quadrilateral has 4 vertices

The number of triangles and quadrilaterals = ⁷C₃ + ⁷C₄ = \frac{7!}{4!3!} + \frac{7!}{4!3!} = 70

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