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Verified by Experts

The correct Answer is:
18

From the figure,
`d^(2)=11^(2)+(r_(1)-r_(2))^(2)` (1)

From the figure,
`d^(2)=7^(2)+(r_(1)+r_(2))^(2)` (2)
From (1) and (2)
`4 r_(1)r_(2)=72` or `r_(1)r_(2)=18`
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