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OG 11 question - need better explanation

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OG 11 question - need better explanation [#permalink] New post 19 Mar 2007, 19:02
I just ran into this problem and I don't really understand the explanation in the book, can someone please tell me how to tackle a question like this:

Of the three-digit integers greater than 700, how many have two digits that are equal to each other and the remaining digit different from the other two?

A) 90
B) 82
C) 80
D) 45
E) 36

I tried just going through and counting but it doesn't seem like the most efficient way and it is definitely prone to errors.
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 [#permalink] New post 19 Mar 2007, 19:15
Hi salr15,

I think this is the same question that lumone posted. :)

Please see my reply to lumone's question, "OG 11- Quant Sample- Question 11"

Hope that explains.
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 [#permalink] New post 19 Mar 2007, 19:33
oh sorry didn't see his posting, thanks! :oops:
  [#permalink] 19 Mar 2007, 19:33
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