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Railways PYQCBT 1 2020

RRB NTPC · Question 98

Find the number of triangles in the diagram given below:

Figure

  1. 30

  2. 31

  3. 32

  4. 29

Show answer & explanation

Answer: (C) 32

Explanation

Each of the three outer fans has five rays from a corner, giving C(5, 2) = 10 triangles each – 30 in all. Adding the inner triangle and the big outer triangle gives 32.