telephone nummer

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Chaitanya_1986: Master | Next Rank: 500 Posts; Posts: 183; Joined: Sat Apr 16, 2011 11:29 amFollowed by: 2 members; Thanked: 7 times

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: Beat The GMAT — Data Sufficiency | Thu May 12, 2011 8:34 pm

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Anurag@Gurome: GMAT Instructor; Posts: 3835; Joined: Fri Apr 02, 2010 10:00 pmFollowed by: 523 members; Location: Milpitas, CA; Thanked: 1854 times; GMAT Score:770

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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