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Which of the following mechanisms are examples of forced closed kinematic pairs?

         1. Cam and roller mechanism

         2. Door-closing mechanism

         3. Slider-crank mechanism     

         Select the correct answer using the code given below.             

         (a) 1 and 2 only              (b) 1 and 3 only

         (c) 2 and 3 only              (d) 1, 2 and 3

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