Two balls is selected at random from the bag contains 2 white, 5 black and 7 green balls.
What is the probability that it is a (i) white ball (ii) at least one green ball.
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Probability = No. of favourable outcomes / No. of total outcomes
= There are 2 white balls and no. of total outcomes will be 2+5+7 = 14
Therefore, Probability of (i) white balls will be 2/14 = 1/7% and for one green ball, probability will be 1/14%
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