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ab = 0?

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Source: — Data Sufficiency |
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by DavidG@VeritasPrep » Thu Nov 23, 2017 6:24 am
lheiannie07 wrote:ab = 0?

(1) a + b + ab = 0
(2) a - b = 0

Can some experts find the best Option in this?

OA E
Statement 1 - Case 1: a = 0 and b = 0. YES ab = 0
Case 2: a = -2 and b = -2. NO ab is not 0.
Not sufficient.

Statement 2: If a- b =0, then a = b. Notice that we can reuse both cases from statement 1, giving us a YES and a NO, both for statement 2 and together. Not sufficient.

The answer is E
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by BTGmoderatorDC » Wed Jan 17, 2018 9:40 pm
DavidG@VeritasPrep wrote:
lheiannie07 wrote:ab = 0?

(1) a + b + ab = 0
(2) a - b = 0

Can some experts find the best Option in this?

OA E
Statement 1 - Case 1: a = 0 and b = 0. YES ab = 0
Case 2: a = -2 and b = -2. NO ab is not 0.
Not sufficient.

Statement 2: If a- b =0, then a = b. Notice that we can reuse both cases from statement 1, giving us a YES and a NO, both for statement 2 and together. Not sufficient.

The answer is E
Thanks a lot!
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