Add : a-b+ab, b-c+bc, c-a + ac Class 8 Ex 9.1 Q 3 (ii)

We have, a-b+ab, b-c+bc, c-a + ac

                  a  – b + ab 
                      +b        – c  + bc 
              +- a             + c          + ac



                  0 +0 + ab +0 + bc  + ac 




Thus, the sum of the expression is ab + bc + ca.

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