Coefficient of linear expansion of brass and steel rods are 1 and 2 . Lengths of brass and steel rods are 1 and 2 respectively. If ( 2 - 1) is maintained same at all temperatures, which one of the following relations holds good ?

1. A. 1 2 = 2 1
2. B. 1 2 2 = 2 1 2
3. C. 1 2 = 2 2 1
4. D. 1 1 = 2 2

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