There are four urns that look the same. In one urn (the special urn), half of the marbles are blue. But only 1/8 of the marbles in the other urns are blue. You pick one of the urns at random and randomly select a marble from it. The marble is blue. What is the strength factor of the evidence you just got that you picked the special urn?
A. 16
B. 2
C. 1/4
D. 4
Answer: D. 4
Mathematics
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