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( ( 1)/(r1) + (1)/(r2)) ((1)/(r2) +(1)/(...

` ( ( 1)/(r_1) + (1)/(r_2)) ((1)/(r_2) +(1)/(r_3))( (1)/(r_3)+(1)/(r_1))` =

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The correct Answer is:
` ( 64 R^(3))/( a^(2) b^(2) c^(2) )`
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