The equivalent thermal conductivity of the wall as shown in figure is

1
\(\frac{k_1+k_2}{2}\)
2
\(\frac{k_1.k_2}{k_1+k_2}\)
3
\(\frac{2k_1.k_2}{k_1+k_2}\)
4
\(\sqrt{k_1.k_2}\)

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