1.

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​

Answer»

ANSWER:

a

Step-by-step EXPLANATION:

ab-a-b+1

a(b-1)-1(b-1)

(a-1)(b-1)



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