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(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

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