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If two metallic plates of equal thicknesses and thermal conductivities K1 and K2 are put together face to face and a common plate is constructed, then the equivalent thermal conductivity of this plate will be

(a) K1K2K1+K2                     (b) 2K1K2K1+K2
(c) K12+K223/2K1K2              (d) K12+K223/22K1K2