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An urn contains 7 white, 5 black and 3 r...

An urn contains 7 white, 5 black and 3 read balls. Two balls are drawn at random. Find the probability that.
(i) Both the balls are red.
(ii) One balls is red and other is black.
One ball is white.

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The correct Answer is:
(i) `(1)/(35)` (ii) `(1)/(7)` (iii) `(8)/(15)`
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