1 Answer

Victor Suzdalev · Answer 1 · 2021-05-17T17:59:09+0000

Answer:

E) 70

Explanation:

Using combination factorial

a triangle has three vertices and a quadrilateral has 4 vertices

The number of triangles and quadrilaterals = ⁷C₃ + ⁷C₄ =
(7!)/(4!3!) + (7!)/(4!3!) = 70

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