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Let four circle having radii r(1)=5 unit...

Let four circle having radii `r_(1)=5` units, `r_(2)=5` units, `r_(3)=8` units and `r_(4)` units `(r_(4) lt 5)` are mutually touching each other externally, then the value of `(2)/(r_(4))` is equal to

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