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The factorisation of ab – a – b + 1 is(a) (a – 1)(b – 1)(b) (a + 1)(b + 1)(c) (a – 1)(b + 1)(d) (a + 1)(b – 1 |
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Answer» a Step-by-step EXPLANATION: ab-a-b+1 a(b-1)-1(b-1) (a-1)(b-1) |
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