A wall consists of alternating blocks of length ‘d’ and coefficient of thermal conductivity K 1 and K 2 respectively as shown in figure. The cross sectional area of the blocks are the same. The equivalent coefficient of thermal conductivity of the wall between left and right is :

1. A. K 1+K 2 2
2. B. 2K 1K 2 K 1+K 2
3. C. K 1+K 2 3
4. D. 3K 1K 2 K 1+K 2

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