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If x and y are odd integers

This topic has 2 expert replies and 2 member replies

If x and y are odd integers

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If x and y are odd integers, which of the following must always be a non-integer?

A. xy
B. x/y
C. y/x
D. xy/2
E. -xy

How will i figure out a non-integer?

OA D

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Hi lheiannie07,

We're told that X and Y are ODD integers. We're asked which of the following will always be a NON-INTEGER. This question can be solved by TESTing VALUES.

IF... X=3 and Y=3
Answer A: 9
Answer B: 1
Answer C: 1
Answer D: 9/2
Answer E: -9

Final Answer: D

GMAT assassins aren't born, they're made,
Rich

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Contact Rich at Rich.C@empowergmat.com

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Hello.

The key in this PS question is: "must always" be a non-integer.

a) xy, the product of two odd integers is integer. OUT.

b) x/y, if x=3 and y=1, then x/y is integer. So, it can be sometimes integer and sometimes not. OUT.

c) as above. OUT.

d) The product of to odd integers ALWAYS is an odd integer. So, xy/2 will be ALWAYS non-integer. CORRECT.

e) as option a). OUT.

I hope this answer can help you.

I'm available if you'd like a follow up.

Regards.

_________________
GMAT Prep From The Economist
We offer 70+ point score improvement money back guarantee.
Our average student improves 98 points.

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EconomistGMATTutor wrote:
Hello.

The key in this PS question is: "must always" be a non-integer.

a) xy, the product of two odd integers is integer. OUT.

b) x/y, if x=3 and y=1, then x/y is integer. So, it can be sometimes integer and sometimes not. OUT.

c) as above. OUT.

d) The product of to odd integers ALWAYS is an odd integer. So, xy/2 will be ALWAYS non-integer. CORRECT.

e) as option a). OUT.

I hope this answer can help you.

I'm available if you'd like a follow up.

Regards.
Thanks a lot!

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Rich.C@EMPOWERgmat.com wrote:
Hi lheiannie07,

We're told that X and Y are ODD integers. We're asked which of the following will always be a NON-INTEGER. This question can be solved by TESTing VALUES.

IF... X=3 and Y=3
Answer A: 9
Answer B: 1
Answer C: 1
Answer D: 9/2
Answer E: -9

Final Answer: D

GMAT assassins aren't born, they're made,
Rich
Thanks a lot!

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