Section 2 #25

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cindyqtran: Junior | Next Rank: 30 Posts; Posts: 21; Joined: Sun Aug 26, 2007 11:45 am

by cindyqtran » Mon Oct 29, 2007 4:28 pm

25. If x and y are consecutive odd integers, what is the sum of x and y?
(1) The product of x and y is negative.
(2) One of the integers is equal to –1.

OA is A

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Source: Beat The GMAT — Data Sufficiency | Mon Oct 29, 2007 4:28 pm

ri2007: Master | Next Rank: 500 Posts; Posts: 258; Joined: Mon Aug 27, 2007 12:43 pm; Thanked: 15 times

by ri2007 » Mon Oct 29, 2007 4:50 pm

You know X & Y are consecutive and odd.

statement 1) product of X & Y is negative. So one number has to be positive and the other has to be negative. Since they are consecutive they only possibility is if they are +1 & -1----so sufficient

statement 2) if one number is -1 the other could be +1 or -3. So the sum could be 0 or -4...so insufficient

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