Question

Which of the following are the factors of a2 + ab + bc + ca
(i) ab – a – b + 1 = (1 – a)(1 – b) (ii) ab – a – b + 1 = (a – 1)(b – 1)
(iii) ab – a – b + 1 = (1 – a)(b – 1) (iv) ab – a – b + 1 = (a – 1)(1 – b)
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Answer 1

Answer:

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