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[" 12.If twe rode of lengthe "L" and "2"...

[" 12.If twe rode of lengthe "L" and "2" L having eqeficient of linear "],[" expansion "a" and "2a" respectively are oonnected end on end,"],[" the average eoefitient of linear expansion of the composite "],[" rod,equale "],[[" (a) "(3)/(2)a," (b) "(5)/(8)a],[" (c) "(5)/(3)a," (d) None of these "]]

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