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Three bags contains a number of red and white balls as follows. Bag I :3 red balls, Bag II: 2 red balls and 1 white ball and Bag III: 3 white balls. The probability that bag i will be chosen and a ball is selected from it is i/6, where i=1,2,3. What is the probability that
a red ball will be selected?

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The correct Answer is:
`7/18`
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