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June 16th, 2011, 08:22 AM  #21 
Senior Member Joined: Dec 2010 Posts: 233 Thanks: 0  Re: Probability
Thank you all so much,sry for late reply.I want to ask about question 2. So ,there are four men,three women and 3 sister(conside 1 object) if need to choose of the sisters,it is 8C1 right,but why from soroban's answer,it shown 7C1.I need to understand.I am confuse. 

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