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In Figure 2.5 5:3 a compressor is shown which is composed of two full adder (F1 & F2) and one-half adder. The working principle of this 5:3 compressor understood as, out of five three are the input to the full adder (F1). Sum output obtained from this full adder and the other two inputs applied to another full adder (F2).

The sum which derived from this full adder is the sum of the compressor, and the carry which obtained from those two full adders given to half adder, the sum of this half adder is taken as SUM2 and carry as SUM3.

Figure 2.4 Compressor 4:3.

Figure 2.5 Compressor 5:3.