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Geometry - Quant/Math - CAT 2009

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Question 4 the day: May 13, 2003

The question for the day is from the topic of Geometry.
Find the number of triangles in an octagon.

(1) 326 (2) 120
(3) 56 (4) Cannot be determined
Correct Answer - (3)
Solution:


No. of triangles =nC3 where n is the no. of points.

Here n = 8 => number of triangles =8C3 = 56.




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