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April 19th, 2011, 11:51 PM  #1 
Senior Member Joined: Dec 2010 Posts: 233 Thanks: 0  Probability(hard question)
Today my teacher gave us a topical test on probability.this is one of the question. In a box containing 20 red apples and 5 green apples,3 of the red apples are rotten and one of the green apples is rotten.Two apples are randomly selected from the box.Calculate the probability that a)both the apples are rotten b)both are red and at least one of them is rotten c)at least one is rotten if both are red d)both are red if it is found that at least one is rotten I construct a tree diagram for this question.i think i am wrong,right?i am confuse about this question.Please help me to solve step by step and explain to me about the concept.Thank you. 
April 20th, 2011, 05:04 AM  #2  
Math Team Joined: Dec 2006 From: Lexington, MA Posts: 3,267 Thanks: 407  Re: Probability(hard question) Hello, hoyy1kolko! Quote:
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April 21st, 2011, 07:04 AM  #3 
Senior Member Joined: Dec 2010 Posts: 233 Thanks: 0  Re: Probability(hard question)
Thank you so much sir,yr explanation is excellent and easy to understand.


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