A test was given to a group of students. Their grades and reactions are summarized below:   A B C Total Grumpy 15 3 13 31 Happy 16 2 12 30 Total 31 5 25 61 If one student is chosen at random, find the probability that the student got a 'C' GIVEN they are happy. 30/61 5/30 12/61 12/30

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