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Consider 3 card one having both side painted red another having both side printed black and last having one side black and another side red, 3 cards are put in a hat and are mixed properly, now one card in picked and put down on table, its face up color is red what is probability that another side will be black.
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Conditional Probability :  similar question

https://gateoverflow.in/41499/gate2014-ec01-ga10?show=41499#q41499

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