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What is the value of \(a - b ?\)

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Source: — Data Sufficiency |
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Re: What is the value of \(a - b ?\)

by dashingnightmare » Fri Jul 24, 2020 10:58 pm

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B

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1. a=b+4
a-b=4, sufficient
2. (a-b)^2=16
a-b=4 or a-b=-4, not sufficient
Hence A.
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