Question 14

Is 'b' positive?
(I) a + b is positive.
(II) a - b is positive.

Solution

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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