Subject :IMO Class : Class 4
What is the least number of sticks to be removed so that there are exactly 4 triangles left?
(a) 3
(b) 4
(c) 5
(d) 6
Ans 1:
Class : Class 4
It should be 5. 3 removed from center triangle and 2 joining the top of the 3 triangle on the bottom there remains 4 triangles : 3 on the bottom and 1 outer triangle
Ans 2: (Master Answer)
Class : Class 1
The correct answer is D.