Question

Add a + b – 1 , b – a + 1

Answer 1

Step-by-step explanation:

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

=2b

.........................

Answer 2

Answer:

2b

Step-by-step explanation:

a + b - 1   +   b - a + 1

⇒ a-a + b+b + 1-1    ___________{all the opp. sign cancels }

⇒ 2b

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