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1. |
Logarithmic mean area of the cylindrical tube is given as |
A. | 2πr <sub>m</sub> |
B. | πr <sub>m</sub>l |
C. | 2πr <sub>m</sub>l |
D. | 2r <sub>m</sub>l |
Answer» D. 2r <sub>m</sub>l | |