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Case 1 - b -> positive
Let a=10, b=1.
Here (a-b) and (a+b) both are positive.
Case 2 - b -> negetive
Let a=10, b= -1.
Here also (a-b) and (a+b) both are positive.
$$\therefore\ $$ Both statements I and II together are not sufficient to answer the question.
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