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CUET
General Test
Quantitative Reasoning
Simplification
The factorisation of ab – a – b + 1 is
(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)
