If n is a positive integer, what is the tens digit of n? (1) : DS Archive
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# If n is a positive integer, what is the tens digit of n? (1)

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07 Aug 2005, 17:08
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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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07 Aug 2005, 20:02
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.

from (1), we know the tens digit of n has to be 6 because what 10n does is
just moving the tens digit to the hundreds digit => suff

from (2), we know for example 69+1 = 70 , and 70+1 =71, therefore undecided => insuff

(A)
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09 Aug 2005, 04:46
'A'
09 Aug 2005, 04:46
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