How many diagonals does a polygon with 18 sides have if three of its vertices, which are adjacent to each other, do not

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How many diagonals does a polygon with 18 sides have if three of its vertices, which are adjacent to each other, do not send any diagonals?

A. 10
B. 25
C. 58
D. 90
E. 91



OA E

Source: Veritas Prep