JEE Main & Advanced Mathematics Permutations and Combinations Question Bank Geometrical Problems

  • question_answer
    The number of diagonals in a octagon will be [MP PET 1984; Pb. CET 1989, 2000]

    A) 28

    B) 20

    C) 10

    D) 16

    Correct Answer: B

    Solution :

    Required number of ways are\[^{8}{{C}_{2}}-8=20\].


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