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Re: Is 1/x greater than 1/y? [#permalink]
Please correct me if I am wrong.

What the question is asking is 1/x > 1/y

So can we not say -x>-y
and hence x<y I think this is what they are asking.

So only B statement proves it.

Please advise. Thanks
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Re: Is 1/x greater than 1/y? [#permalink]
Jabjagotabhisavera wrote:
meetsampat wrote:
Please correct me if I am wrong.

What the question is asking is 1/x > 1/y

So can we not say -x>-y
and hence x<y I think this is what they are asking.

So only B statement proves it.

Please advise. Thanks


Hi meetsampat,

You cant cross multiply variable unless you consider signs of those variable.




Here you have to consider the following cases.

1. Both x and y are positive
2. Both x and y are negative
3. x is positive, y is negative
4. x is negative and y is positive

Based on the signs of the variable, the inequality sign will change while doing cross-multiplication.




Yes... I did not think on signs..Thanks !!
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Re: Is 1/x greater than 1/y? [#permalink]
C.
for 1/x > 1/y, X has to be less than Y. And B says exactly that. Wait, if X is negative, signs change. Therefore, X also has to be positive. And A states exactly that. Therefore C.
Further, just for info, none can be 0 otherwise division wont be possible. But both the choices are complete in themselves and take care of that.
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Re: Is 1/x greater than 1/y? [#permalink]
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Re: Is 1/x greater than 1/y? [#permalink]
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