UPSC NDA 2 2012 Mathematics Paper
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Directions: For the next two (02) questions that follow:
An urn contains one black ball and one gree ball. A second urn contains one white and one green ball. One ball is drawn at random from each urn.
An urn contains one black ball and one gree ball. A second urn contains one white and one green ball. One ball is drawn at random from each urn.
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Question : 117 of 120
Marks:
+1,
-0
What is the probability that both balls are of same colour?
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