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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by BTGmoderatorDC » Mon Jan 24, 2022 6:33 pm

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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

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Source: Beat The GMAT — Problem Solving | Mon Jan 24, 2022 6:33 pm

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