Question 3 (a) (ii) Flip-flops are basic memory element used in sequential circuits. Flip-flop has two stable states - logic 0 or logic 1. Using D- Flip flops and waveforms, explain the working of a 4-bit SISO shift register. (AN 5marks) (ii) Determine the binary numbers represented by the following decimal numbers. (i) 25.5 (ii) 10.625 (iii) 0.6875 (AN 3marks) (b) (i) A synchronous counter with 4-bit, uses flip-flops with propagation delay times of 15 ns each. What is the Maximum possible time required for change of state, and why? (AP 5marks) (ii) Addition of decimal numbers can also be performed using excess- 3 codes. Add 876 and 704 in excess-3 code. (AP 2marks) (c) Digital logic functions (equations) can be simplified using the theorems of Boolean algebra. The reduced Boolean expression helps in getting simple, less expensive and smaller circuit. Simplify and draw the logic diagram using the expression below F= ABC+ ABC+ ABC+ ABC+ ABC. (AP 5marks)