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Data Sufficiency (DS) | Re: If x is an integer, is sqrt[(x^2)-(y^2)] an integer?

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Thank you very much for the reply. I really appreciate your help.

The example is from NOVA Gmat prep course which was recommended in one of the Magoosh's study plan. For that reason, I thought the material should be fairly decent. To be honest, what I like about it is that many math questions seem to be more challenging than the official quant prompts. Though I think I might skip it entirely for verbal section.

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