Factorise:1 + a + b − c + ab-
bc — ca - abc
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Answer:
1-c+a-ca+b-bc+ab-abc
1(1-c)+a(1-c)+b(1-c)+ab(1-c)
(1-c)(1+a+b+ab)
either 1-c=0
c=1
1+a+b+ab=0
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