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Bag I: 3 red, 4 black; Bag II: 5 red, 6 black. Pick a bag at random; P(red)?
A4/9
B1/2
C15/77
D34/77
Answer & Solution
Correct answer: D. 34/77
P(red) = (1/2)(3/7) + (1/2)(5/11) = 33/154 + 35/154 = 68/154 = 34/77.
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