Naveen has four bundles of three sticks each. He wants to join the three sticks of one bundle end to end to make a triangle. Which bundle will work?

Explanation

1. 01

   In a triangle, the two shorter sides must add up to MORE than the longest side.

2. 02

   $3 + 4 = 7$ is less than 8; $5 + 6 = 11$ is less than 12; $2 + 9 = 11$ only equals 11, so those sticks lie flat.

3. 03

   $4 + 7 = 11$ is more than 10, so 4 cm, 7 cm and 10 cm make a triangle.