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Source: Manhattan Prep
If \(x\) and \(y\) are positive integers and \(\frac{1620x}{y^2}\) is the square of an odd integer, what is the smallest possible value of \(xy\)?
A. 1
B. 8
C. 10
D. 15
E. 28
The OA is C
If \(x\) and \(y\) are positive integers and \(\frac{1620x}{y^2}\) is the square of an odd integer, what is the smallest possible value of \(xy\)?
A. 1
B. 8
C. 10
D. 15
E. 28
The OA is C
