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新gre数学重要考点知识Multiple Times

信息来源:网络  发布时间:2012-01-04

  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.
 

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