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A mild steel bar is in three parts, each 200mm long as shown in fig. The diameters of the parts are indicated on the diagram. The bar is subjected to axial pull of (P) N. If E=2×105 MPa and the elongations in the three parts AB,BC, and CD are Δ1,Δ2,and Δ3 respectively, then the ratio of the greatest elongation to the least elongation will be :
i) 9
ii) 4
iii) 3
iv) 2