1 There are three cards in a bag The first card has the symb

(1) There are three cards in a bag. The first card has the symbol X written on both sides, the second card has the symbol O written on both sides, and the third card has an X on one side and an O on the other. You draw one card at random and examine one side of this card. You see an X. What is the probability that there is also an X on the other side?

Solution

card with X with one or two sides =2

given that card with oneside X, the probability of both side x = 1/2 =0.5