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    OlympiadEasyCombinatorics5–6

    How many diagonals does a hexagon have?

    Quantas diagonais tem um hexágono?

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    Solution

    Diagonals =n(n−3)2=6×32=9= \frac{n(n-3)}{2} = \frac{6 \times 3}{2} = 9.