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GMAT Inequalities is a high-frequency topic in GMAT Quant, but many students struggle because the concepts behave differently from standard algebra. Understanding the right rules, patterns, and edge cases can significantly improve both speed and accuracy.- May 06
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28 Apr 2020, 04:32
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Bunuel
Basically the only option we have is to choose the three people who will stand in the front row. All other permutation will be governed by the height order and hence is 1 (since there can only be one way to line up people as per their height unless the height is same). So the answer should be 6C3, right? Just wanted to confirm if this is the correct approach.
Basically the only option we have is to choose the three people who will stand in the front row. All other permutation will be governed by the height order and hence is 1 (since there can only be one way to line up people as per their height unless the height is same). So the answer should be 6C3, right? Just wanted to confirm if this is the correct approach.
28 Apr 2020, 13:34
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MG1105
Hi MG1105,
6c3 = (6)(5)(4)(3)(2)(1) / (3)(2)(1)(3)(2)(1) = 20..... but that answer is not even among the answer choices.
The issue with the logic that you've described is that not every person can appear in every "spot", so you're not just choosing 3 people for the 'front row' - you also have to end up with a set of 3 people for the 'back row' that fits all of the restrictions defined in the prompt.
GMAT assassins aren't born, they're made,
Rich
