Question 1171687
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(a)  P(C) = 1 - P(A) - P(B) = 1 - 0.87 - 0.1 = 0.03.


(b)  P(A^c) = 1 - P(A) = 1 - 0.87 = 0.13.
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Solved.


And in addition, so as not to get up twice, 2 x 2 = 4.