(a+ab-b) (b-c) (c-a+ac)
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(i) ab − bc, bc − ca, ca − ab ( ii) a − b + ab, b − c + bc, c − a + ac (iii) 2p^2q^ 2 − 3pq + 4, 5 + 7pq − 3p^2q^2 (iv) l^2 + m^2, ...
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