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Which of the following must be true?

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Senior | Next Rank: 100 Posts
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by phanikpk » Tue Jun 24, 2014 8:05 am
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I have selected B based on
if x=y, then only 3 will come and we will get a prime number less than 2.
Remaining statements doesn't hold true.
Please help if I am missing anything.
OA is A [/img]
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by GMATinsight » Tue Jun 24, 2014 8:26 am
x could be 15 and y could be 9 and then 3x/y = (3 x 15)/9 = 5 which is prime number.

Therefore answer A is correct. None of the results is essentially true.

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by GMATGuruNY » Tue Jun 24, 2014 8:29 am
Which must be true?

I) x=y
II) y=1
III) x and y are prime integers
If 3x/y = 5, then 3x=5y.
In this case, it's possible that x=10 and y=6.
Thus, none of the options must be true.
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by [email protected] » Tue Jun 24, 2014 7:18 pm
Hi phanikpk,

When a GMAT Quant question asks "which of the following MUST be true?", the way to interpret this question is in the following manner:

"…which of the following is ALWAYS TRUE, NO MATTER HOW MANY DIFFERENT VARIATIONS YOU CAN THINK OF?" By definition, this will require a higher level of thinking on your part and likely a bit more work.

You did enough work to prove that X=Y COULD be true, but with a bit more work, you would have proved that it ISN'T ALWAYS true.

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