Q7. Add the following.
(i)a - b + ab, b - c+ bc, c-a + ac
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Add the following.
(i)a - b + ab, b - c+ bc, c-a + ac
ab + bc + ac
(a - b + ab) +( b - c + bc) + ( c - a + ac)
= a - b + ab + b - c + bc + c - a + ac
= ab + bc + ac
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