You are given four balloons: red, blue, green and yellow. Some (or all) of the balloons might be counterfeit.
A detector box can display the quantity of counterfeit balloons inside the box.
Your task is to detect all the genuine balloons using the detector box not over three times.

How would you do it?

Source: Russian Kvantik.

(In reply to Solution by Jer)

../." So for example if the first detection says 2 counterfeits and the second and third each say 1.  We know that only B and D are counterfeits

No, we do not.  B and  C are .

Posted by Ady TZIDON on 2016-01-13 04:20:58