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foreign and welcome back in this session we are going to observe the sign bit extension part one but before diving straight into the context today we would like to observe the road map which we have been following so far now think about it we are in the course of COA now in this chapter we have been learning about the number systems and in our due course we observe the number systems unary binary octal decimal and hexadecimal now COA basically deals with the architecture of the computer and that is the reason why among all the number systems we were mainly focusing on binary and hexadecimal now from these we have covered the memory portion now coming to the CPU it actually has four different segments and among all these the arithmetic and logic unit is the unit which helps us with all the calculations now if you remember couple of sessions back we talked about the four bit triple carry adder and there we proposed the circuit that is error subtractor that is a single circuit which can