16. What is the two's complement of 1011100111? 17. Explain function of each element in Figure 3. (Register A, B, C, Clock, Carry out, D, C,Q, PRE S. CI, CO) Subtractor Circuit Register A Register C Register B SL PRE CI CO Clock D Carry Out (Sign BIU Figure 3 18. In the Figure 4, Register Ais 1011 and Register B is 0010. a. What are the contents of register Cafter 2 dock pulses? b. What is the output of flip flop (Q) after the second dock pulse? c. What is the output of flip flop (0) after the third clock pulse? d. What are the contents of register Cafter 5 dock pulses? Adder Circuit Register A Register C Register B B CI CO CLR D Q UDC Clock Figure 4 19. The serial adder required ten clock pulses to add two, five bit binary numbers. (True or false. If it is false write correct one.)