1. A+B(Bit Operation) Which of following is equivalent to atb: Pick ONE OR MORF options Clear Selection The order of the element entering the Stack is 1,2,3,… , n . n . (n⩾3) The order of the element exiting the stack is p1,p2 , coppn . if p2=3 , what is the number of possibilities of p3? Pick ONE option Clear Selection