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1. \(\frac{1}{a} >\frac{1}{2}\) \(\frac{2}{a>1}.....a<2\), And since a>b>0, b is also less than 2 Sufficient
2. \(\frac{1}{a} + \frac{a}{b} = 1\) Three cases... a) a<1 ..... then 1/a >1 and so a/b should be less than 0 to negate excess in 1/a.. Means b<0.... But b>0, so not possible b) a=1....then 1/a=1/1=1 and so a/b that is 1/b , should be 0...Not possible c) a>1... Then 1/a<1 and a/b is also<1.... But a/b<1 means a<b....but we are given a>b>0 9 So none of the value can fit in..