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A lottery ticket vendor sells lottery tickets that, when [#permalink]
09 Jul 2006, 03:32
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A lottery ticket vendor sells lottery tickets that, when scratched, reveal whether or not the holder has won a prize. If each ticket has a 25% chance of carrying a prize, what is the lowest number of tickets that Diane could but that would ensure that grandmother would have at least a 75% chance of experiencing the thrill of winning a prize?