Cards

Suppose that are three cards in the hats. One is red on both sides, one of which is black on both sides, and a third one side red and the second black. We are pulled out of a hat randomly one card and we see that one side of it is red. What is the probability that the second side is red?

Correct result:

p =  0.5

Solution:

$p=1\mathrm{/}2=\frac{1}{2}=0.5$

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