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A) \[{{r}_{2}}/{{r}_{1}}\]
B) \[\sqrt{({{r}_{2}}/{{r}_{1}})}\]
C) \[{{({{r}_{2}}/{{r}_{1}})}^{2}}\]
D) \[{{({{r}_{1}}/{{r}_{2}})}^{2}}\]
Correct Answer: D
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