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    Question

    A polygon has 170 diagonals, the number of sides of the

    polygon is? 
    A 14 Correct Answer Incorrect Answer
    B 12 Correct Answer Incorrect Answer
    C 8 Correct Answer Incorrect Answer
    D 20 Correct Answer Incorrect Answer

    Solution

    The number of diagonal of N sided polygon = N(N-3)/2 = 170 or N(N - 3) = 340 So by options , N = 20

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