a) Consider a circular queue with N=10 Find the number of elements in the queue for the following Rear and Front position

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a) Consider a circular queue with N=10 Find the number of elements in the queue for the following Rear and Front position.

                                             i.          Rear=8, front = 4

                                             ii.        Rear = 0, Front= 3

b)     Convert following infix expressions to prefix?                                         

             (300+23)*(43-21)/ (84+7)

c)     State two practical examples of stack in computer science.