UPSC 2017 CDS I Math Paper

Remember: In a triangle, the sum of any two sides is always greater than the third side.
Consider the triples (2, 3, 6).
Here, 2+3=5<6.
Since the sum of the sides 2 and 3 is not greater than the third side 6, so the triples (2, 3, 6) do not represent the sides of a triangle