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Bunuel
If x is positive, is x² < x?

(1) 1/10 < x < 2/5
(2) x³ < x²

Given: x is positive

Target question: Is x² < x?
This is a great candidate for rephrasing the target question.
Below is a video with tips on rephrasing the target question

Since x is POSITIVE, we can safely take the inequality x² < x and divide both sides by x to get: x < 1
REPHRASED target question: Is x < 1?

Statement 1: 1/10 < x < 2/5
This means x is definitely less than 1
So, the answer to the REPHRASED target question is YES, it IS the case than x < 1
Since we can answer the REPHRASED target question with certainty, statement 1 is SUFFICIENT

Statement 2: x³ < x²
Since we can be certain that x² is POSITIVE, we can safely divide both sides by x² to get: x < 1
So, the answer to the REPHRASED target question is YES, it IS the case than x < 1
Since we can answer the REPHRASED target question with certainty, statement 2 is SUFFICIENT

Answer: D

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