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Consider the following statements associated with extrusion process?

         1. In forward hot extrusion the problem of friction is prevalent because of the relative motion between the heated metal billet and he cylinder walls

         2. The backward hot extrusion completely overcomes the friction

         3. It is possible to make components which have a constant cross section over any length

         Which of the statements given above are correct?

(a) 1,2 and 3       (b) 1 and 2       (c) 2 and 3       (d) 1 and 3

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