A physical quantity is $A = P^2/Q^3.$ The percentage error in measurement of $P$ and $Q$ is $x$ and $y$ respectively. Maximum error in measurement of $A$ is
A$2x -3y$
B$3x -2y$
C$3x + 2y$
D$2x + 3y$
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D$2x + 3y$
d $\frac{{\Delta A}}{A} = \frac{{2\Delta P}}{P} + \frac{{3\Delta Q}}{Q}$
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