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If a 3-digit integer is selected at random from the integers

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If a 3-digit integer is selected at random from the integers [#permalink] New post 25 Aug 2003, 19:26
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13. If a 3-digit integer is selected at random from the integers 100 through 199, inclusive, what is the probability that the first digit and the last digit of the integer are each equal to one more than the middle digit?
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 [#permalink] New post 25 Aug 2003, 21:51
The only number that satisfies this is 101. Since there are 100 numbers from 100-199 inclusive, then the probability is 1/100.
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  [#permalink] 25 Aug 2003, 21:51
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If a 3-digit integer is selected at random from the integers

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