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Updated on: 18 Jun 2023, 06:08
Originally posted by loveparis on 09 Feb 2011, 15:20.
Last edited by mysterymanrog on 18 Jun 2023, 06:08, edited 2 times in total.
Last edited by mysterymanrog on 18 Jun 2023, 06:08, edited 2 times in total.
typo correction
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A
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44%
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If x and у are non-negative integers, what is the value of xy?
(1) 7^x = 13^y
(2) 3^x = 9^y
(1) 7^x = 13^y
(2) 3^x = 9^y
10 Feb 2011, 13:47
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loveparis
If x and у are none negative integer, what is the value of xy?
(1) 7^x = 13^y --> as given that \(x\) and \(y\) are integers then \(x=y=0\) (in this case \(7^0 =13^0=1\)) --> \(xy=0\). Sufficient.
(2) 3^x = 9^y --> \(3^x = 3^{2y}\) --> \(x=2y\) --> \(xy=2y^2\), for different values of \(y\) the answer will be different. Not sufficient.
Answer: A.
10 Feb 2011, 13:55
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(1) 7^x = 13^y.
This is true only for x=0 and y=0 because 7 and 13 are both prime numbers.
Sufficient.
(2) 3^x = 9^y.
3^x=3^2y
x=2y
We can't find specific value for x or y.
Not sufficient.
Ans: "A"
This is true only for x=0 and y=0 because 7 and 13 are both prime numbers.
Sufficient.
(2) 3^x = 9^y.
3^x=3^2y
x=2y
We can't find specific value for x or y.
Not sufficient.
Ans: "A"
