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Question

Consider the five points comprising the vertices of a square and the intersection point of its diagonals. How many triangles can be formed using these points?                  (CAT 1993)
  1. 6
  2. 8
  3. 4
  4. 10


Solution

The correct option is B 8

The number of points will be \(^5C_3\) - 2 = 8

(2 because of the 2 diagonals)

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