Technical personal has asked me one logical question where he drawn three different boxes and written random label to each boxes. And each boxes has two bolls with different colors. He just asked to check weather the label of each box is right or wrong. If its not right then how will you correct it in right way. And he said you can open any two of them box and guess the right label name. I took 2-3 minutes and answered him. He said yes its right but we can do it some other way.