Combinational logic help

Discussion in 'Homework Help' started by activee, Jan 25, 2014.

  1. activee

    Thread Starter Member

    Jan 16, 2014
    I can't figure out how to change this expression and this will help me for a better understanding of adders.

    A'BC + AB'C + ABC' + ABC = C . ( A xor B) + AB
    my result so far is
    A'BC + AB'C + ABC' + ABC= C ( A'B + AB' + AB) + ABC' = C(A+B) + ABC' then I'm stuck.

    I don't know you go from this : C(A+B) + (AB)C' to this: C( A xor B) + AB .
    thanks in advance
  2. WBahn


    Mar 31, 2012
    Since you know what the answer is supposed to be, try starting from the answer and see if you can get back to the original starting point. If you can, then see if you figure how to back track that and go the other way (the way you wanted to originally).