ISRO Computer Science (CSE) 2013 - Question 72

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How many diagonals can be drawn by joining the angular points of an octagon?

  • A. 14
  • B. 20
  • C. 21
  • D. 28

Answer: B. 20

Explanation: Diagonals = n(n-3)/2 = 8(5)/2 = 20.

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