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Option ( b )
Step-by-step Explanation....
3a - 2b - ab - ( a - b + ab ) + 3ab + b - a
= 3a - 2b - ab - a + b - ab + 3ab + b - a
= 3a - a - a - 2b + b + b - ab - ab + 3ab
= 3a - 2a - 2b + 2b - 2ab + 3ab
= a + ab
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