Two circles touch each other externally. If the sum of the areas of two circles is \( 153 \pi \)...

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Two circles touch each other externally. If the sum of the areas of two circles is \( 153 \pi \) and the sum of their radii is 15 , then the ratio of the larger to the smaller radius is
a. \( 4: 1 \)
b. \( 2: 1 \)
c. \( 1: 2 \)
d. None of these
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