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telephone nummer

by Chaitanya_1986 » Thu May 12, 2011 8:34 pm
In the telephone number 936-215X, what digit does X represent?
(1) Only one digit in the telephone number is greater than X.
(2) X is the greatest of the digits not among the telephone number's first six digits.

OA B
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Source: — Data Sufficiency |

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by Anurag@Gurome » Thu May 12, 2011 8:57 pm
Chaitanya_1986 wrote:In the telephone number 936-215X, what digit does X represent?
(1) Only one digit in the telephone number is greater than X.
(2) X is the greatest of the digits not among the telephone number's first six digits.

OA B
Solution:
Obviously, (1) implies that X can be 6,7 or 8.
So, (1) alone is not sufficient.
The digits not present in the first six places are 0, 4, 7, and 8.
8 is the greatest.
So, X = 8.
Or (2) alone is sufficient.
The correct answer is (B).
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