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A bag contains 20 balls. 8 balls are green,7 are white and 5 are red. What is the minimum number of balls that must be picked up from the bag blind -floded (without replacing any of it ) to be assured of picking atleast one ball of each colour ?
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When three coins are tossed together the probability that all coins have the same face up is
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There are three drawers in a table. One contains two gold coins,another two silver coins, and the third a silver coin and a gold coin. One of the drawers is pulled out and a coin is taken out. It turns out to be a silver coin. What is the probability of drawing a gold coin,if one of the other two drawers is pulled out next and one of the coins in it is drawn at random ?
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