No physicist has ever "seen" an electron. Yet, all physicists believe in the existence of electron. An intelligent but superstitious man advances this analogy to argue that 'ghosts' exist even though no one has 'seen' one. How will you refute his argument?

Two dice, one blue and one grey are thrown at the same time. Write down all the possible outcomes. : A student argues that 'there are 11 possible outcomes 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 and 12. Therefore, each of them has a probability 1/11 . Do you agree with his argument ? Justify you answer :