Question

In a game, a man wins rupee five for number  six and losses rupee one for any other number, when a fair die is thrown. The man decided to throw a die thrice but to quit as and when he gets a six. Find the expected value of the amount he wins/losses.

Answer 1

   ∑xP(x) =(180+120+75-375) =0

:.  Expected value = Rs. 0