Data Sufficiency (DS) | If xyz = 1001, is x odd? (1) y is odd (2) z is odd

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Now, before we reveal the answer choices and choice-by-choice statistics from Question Bank users, let’s point this out: this question ranks as one of the top 30 most difficult questions in the bank, with only 15% of all respondents answering correctly (and, as you’ll see, a sample size of over 200 users). And consider this: in GMAT multiple choice questions a random guess has
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