--->In ripple carry adders, the carry propagation time is the major speed limiting factor.
--->Most other arithmetic operations, e.g. multiplication and division are implemented using
several add/subtract steps. Thus, improving the speed of addition will improve the speed
of all other arithmetic operations.
--->The addition of two binary numbers in parallel implies that all the bits of augend and addend available for computation at the same time.
--->Pi=Ai^Bi;
--->Gi=Ai&Bi;
--->The output sum and carry can be expressed as
--->Si=Pi^ci;
--->Ci+1=Gi+PiCi;
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