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

Question

3 years ago

8

65E. 70

1 answer:

kondaur [170] · Answer 1 · 2022-05-31T09:51:07+03:00

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