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Director
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If xy=13, then which of the following can't be the value of xy?
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24 Jun 2019, 21:52
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40% (02:25) correct 60% (02:19) wrong based on 149 sessions
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If xy=13, then which of the following can't be the value of xy? A. 9 B. 13 C. 17 D. 18 E. 29
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Director
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Re: If xy=13, then which of the following can't be the value of xy?
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26 Jun 2019, 01:20
1. xy≥xy xy≥ 13 xy≥13 or xy≤13 Hence A is the answer 2. We can notice that all the options are ve, hence x<0 If x<0 and y>0 and xy=13 then x= 13k and y= k, , where k is positive real number xy=132k (less than 13) If x<0 and y<0 then x= 13k and y=k xy=13 You can use either approach. nick1816 wrote: If xy=13, then which of the following can't be the value of xy?
A. 9 B. 13 C. 17 D. 18 E. 29



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Re: If xy=13, then which of the following can't be the value of xy?
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13 Jul 2019, 08:17
@veritaskrishna
I think 18 and 9 both cant be value of xy. Correct me if I am wrong.
Here 18 being an even number, can only be a difference of two odd numbers or two even numbers. However, 13 can only be a difference of OddEven or EvenOdd numbers.
I fail to understand how 18 can be a value of xy? Please explain.



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Joined: 09 Aug 2017
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Re: If xy=13, then which of the following can't be the value of xy?
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13 Jul 2019, 08:35
Same doubt is in my mind. Karan0912 wrote: @veritaskrishna
I think 18 and 9 both cant be value of xy. Correct me if I am wrong.
Here 18 being an even number, can only be a difference of two odd numbers or two even numbers. However, 13 can only be a difference of OddEven or EvenOdd numbers.
I fail to understand how 18 can be a value of xy? Please explain.



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Re: If xy=13, then which of the following can't be the value of xy?
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13 Jul 2019, 08:48
x and y can be any real numbers. They can be rational or irrational numbers. Never assume anything in GMAT exam, if it's not explicitly mentioned. If x=15.5 and y=2.5 xy=13, and xy=18 Karan0912 wrote: @veritaskrishna
I think 18 and 9 both cant be value of xy. Correct me if I am wrong.
Here 18 being an even number, can only be a difference of two odd numbers or two even numbers. However, 13 can only be a difference of OddEven or EvenOdd numbers.
I fail to understand how 18 can be a value of xy? Please explain. Posted from my mobile device



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Re: If xy=13, then which of the following can't be the value of xy?
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13 Jul 2019, 08:53
Here we can see that the options are all negative. Hence x<0 According to given question x>y and x <= 13, y<=0 to get a value of 13. Therefore xy is always less than or equal to 13. Hence xy cannot be 9.
Hence the answer is A.



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Re: If xy=13, then which of the following can't be the value of xy?
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13 Jul 2019, 09:05
sunnapuajaykumar wrote: Here we can see that the options are all negative. Hence x<0 According to given question x>y and x <= 13, y<=0 to get a value of 13. Therefore xy is always less than or equal to 13. Hence xy cannot be 9.
Hence the answer is A. xy=13 if y<0 y = y x = 13y xy = 132y<13 IMO A
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Re: If xy=13, then which of the following can't be the value of xy?
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27 Jul 2019, 01:16
nick1816 wrote: 1. xy≥xy xy≥ 13 xy≥13 or xy≤13 Hence A is the answer 2. We can notice that all the options are ve, hence x<0 If x<0 and y>0 and xy=13 then x= 13k and y= k, , where k is positive real number xy=132k (less than 13) If x<0 and y<0 then x= 13k and y=k xy=13 You can use either approach. nick1816 wrote: If xy=13, then which of the following can't be the value of xy?
A. 9 B. 13 C. 17 D. 18 E. 29 How do I know that xy≥xy is true? Is this a general rule or how can I see it with the information given?



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Re: If xy=13, then which of the following can't be the value of xy?
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27 Jul 2019, 01:45
xy≥xy It's true for every real number. 1. If x and y have opposite signs, xy>xy 2. If x and y have same signs and x>y, then xy=xy 3. If x and y have same signs and x<y, then xy>xy Luca1111111111111 wrote: nick1816 wrote: 1. xy≥xy xy≥ 13 xy≥13 or xy≤13 Hence A is the answer 2. We can notice that all the options are ve, hence x<0 If x<0 and y>0 and xy=13 then x= 13k and y= k, , where k is positive real number xy=132k (less than 13) If x<0 and y<0 then x= 13k and y=k xy=13 You can use either approach. nick1816 wrote: If xy=13, then which of the following can't be the value of xy?
A. 9 B. 13 C. 17 D. 18 E. 29 How do I know that xy≥xy is true? Is this a general rule or how can I see it with the information given?




Re: If xy=13, then which of the following can't be the value of xy?
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27 Jul 2019, 01:45






