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A box contains 3 black and 5 white ball ...

A box contains 3 black and 5 white ball and an another box contains 5 black and 3 white ball. Two same colour of ball is transferred from first box to second box and a ball drawn at random from second box. What is the probability that ball is black?

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The correct Answer is:
`=3/28 xx 7/10 + 10/28 xx 5/10 = 21/280 + 50/280 = 71/280`
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