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There are four, six faced dice marked 1 ...

There are four, six faced dice marked 1 to 6 of which two are fair and two are loaded such that the probability of getting a multiple of 3 is twice as probable to get as any other number. A die is chosen at random and rolled. It shows six, the probability that it was biased, is (A) 1/8 (B) 1/4 (C) 2/5 (D) 3/5

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