Out of the Box Thinking

A beam of light is incident through the holes on side A and emerges out of the holes on the other face of the box as shown in Figure. Which of the following could be inside the box ?

Twenty first century has turned out to be a century of problems contrary to the thinking that it would be a better time

Box A contains 2 black and 3 red balls while box B contains 3 black and 4 red balls.Out of the setwo boxes one is selected at random and the probability of choosing box A is double that of box B.If a red ball is drawn from the selected box,then the probability that it has come from box B is

A box contains 5 red marbles, 8 white marbles and 4 green marbles. One marble is taken out of the box at random. What is the probability that the marble taken out will be: (i) red ? (ii) white? (iii) not green?

A box contains 5 red marbles,8 white marbles and 4 green marbles.One marble is taken out of the box at random.What is the probability that the marble taken out will be ( i) red? ( ii) white? (iii) not green?

A box contains 5 red marbles,8 white marbles and 4 green marbles.One marble is taken out of the box at random.What is the probability that the marble taken out will be (i) red? (ii) white? (iii) not green?