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2012年新GRE数学考点指导——Multiple Times(1)

2012-11-03 

  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.

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