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If n is a positive integer, what is the tens digit of n? 1)

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If n is a positive integer, what is the tens digit of n? 1) [#permalink] New post 07 Nov 2005, 00:18
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If n is a positive integer, what is the tens digit of n?

1) The hundreds digit of 10n is 6

2) The tens digit of n+1 is 7
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 [#permalink] New post 07 Nov 2005, 00:27
A.

(1) multiplying by 10 shifts tenth digit one left.

(2) n can be 69 or 7x
so tenth digit can be 6 or 7. insufficient
  [#permalink] 07 Nov 2005, 00:27
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If n is a positive integer, what is the tens digit of n? 1)

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