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Q.

If r1  and  r2 be the maximum and minimum radius of the circle which pass through the points  (4,3) and touch the circle x2+y2=49  then r1r2  is…..

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answer is 6.

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Detailed Solution

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r1+r2=7 and 5+2r2=7⇒r2=1 and r1=6
r1r2=6

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