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The factorisation of ab – a – b + 1 is |
(a – 1)(b – 1) (a + 1)(b + 1) (a – 1)(b + 1) (a + 1)(b – 1). |
(a – 1)(b – 1) |
ab – a – b + 1 Taking 'a' common from the first two terms: = a (b - 1) -1 (b - 1) = (a - 1) (b - 1) |
