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Three metal rod A, B and C of same length and cross-section are placed end to end and a temperature difference is maintained between the free ends of A and C. If the thermal conductivity of `B(K_B)` is twice that of `C(K_C)` and half that of `A(K_A)`, then the effective thermal conductivity of the system will be

A

`(K_(A))/7`

B

`(6K_(B))/7`

C

`(7K_(B))/3`

D

`7K_(C)`

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