[gre数学概率知识点]GRE数学重要知识点:MultipleTimes

副标题:GRE数学重要知识点:MultipleTimes

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  Multiple Times


  If probability of an event happening is p, then the probability that the event happens n times in a row is p∧n.


  Example:


  The probability that a coin toss results in head is 0.5. Then the probability that when the coin is tossed twice, both of them are head is 0.5∧2=0.25.


  Probability that a roll of a six-sided die land with face 1 is 1/6. Then the probability that 1 will turn up three times in a row is (1/6)∧3.


  Remember:


  Note that probability of the event happening does not change from trial to trial.


GRE数学重要知识点:Multiple Times.doc

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