veritas ds#42

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pradeepkaushal9518: Legendary Member; Posts: 1309; Joined: Wed Mar 17, 2010 11:41 pm; Thanked: 33 times; Followed by:5 members

veritas ds#42

by pradeepkaushal9518 » Mon Aug 30, 2010 5:25 am

if a and b are consecutive negative integers, is b greater than a?

1. a+1 and b-1 are consecutive negative integers
2. b is an odd number.

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Source: Beat The GMAT — Data Sufficiency | Mon Aug 30, 2010 5:25 am

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Rahul@gurome: GMAT Instructor; Posts: 1179; Joined: Sun Apr 11, 2010 9:07 pm; Location: Milpitas, CA; Thanked: 447 times; Followed by:88 members

by Rahul@gurome » Mon Aug 30, 2010 6:54 am

pradeepkaushal9518 wrote:if a and b are consecutive negative integers, is b greater than a?

1. a+1 and b-1 are consecutive negative integers
2. b is an odd number.

(1) If a = -3 and b = -2, then b > a (Note: a + 1 = -2 and b - 1 = -3)
If a = -7 and b = -6, then b > a (Note: a + 1 = -6 and b - 1 = -7)
So, (1) is SUFFICIENT.

(2) If b = -3 and a = -4 then b > a
If b = -3 and a = -2 then b < a
We don't get a unique answer.
So, (2) is NOT SUFFICIENT.

The correct answer is [spoiler](A)[/spoiler].

Rahul Lakhani
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