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Let A = ⎥ ⎥ ⎥ ⎦ ⎤ ⎢ ⎢ ⎢ ⎣ ⎡ + 2 b 1 b 1 b b 1 b 2 2 where b > 0. Then the minimum value of b ) A det( is -

1. 3
2. – 3 2
3. 3 −
4. 3 2

Correct answer: 3 2

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