RRB Group D 15-Sep-2018 Shift 1 Solved Paper

Question : 28 of 100

Marks: +1, -0

The number of diagonals in a 27 -sided polygon is

Solution:

\;\text " Number of diagonals "\;=\;{27(27-3)}/{2}

\;\; =\;{27 × 24}/{2}=324

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