Found this problem: And the correct answer is: 2
Counter-Argument: What if
- Red Box : Green Balloons
- Yellow Box: Blue Balloons
- Blue Box: Red Balloons
- Green Box: Yellow Balloon
Thus, we need to open minimum of 3 boxes to know what is contained in all the boxes"
Doesn't that makes sense?
I know the question asked for MINIMUM NUMBER OF BOXES, and if you'll look at the explanation, they have proved their answer. But what if there happens to be the case mentioned above?