Add a + b – 1, b – a + 1, 1 – 2b
(a) 1
(b) -1
(c) 2
(d) -2
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Answer:
1
answer
=a+b-1 + b-a+1 + 1-2b
=keeping all like term with each other
=a-a+b+b-2b-1+1+1
=1
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