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A bag contains 3 white, 4 black and 2 ye...

A bag contains 3 white, 4 black and 2 yellow balls. 2 balls are drawn at random.
 i. Find the probability that the two balls drawn are of the same colour.
ii. Find the probability that none of the balls drawn are yellow in colour.

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The correct Answer is:
i. `(5)/(18)`, ii. `(7)/(12)`
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