the sum of a+b-1,b-a+1,1-2b is ______. （steps needed ）
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+1
Step-by-step explanation:
a+b-1 +b-a+1+1-2b
placing same digit in order
a-a+b+b-2b -1+1+1
+a and -a becomes 0 then +2b and -2b becomes 0 and +1 and -1 becomes 0
+1 is only remaining which is the answer
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