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Let f(x) + 2f 1 x       = x 2 + 5 and 2g (x) – 3g 1 2       = x, x > 0. If  = 2 1 f (x)dx  , and  = 2 1 g(x)dx  , then the value of 9  +   is :

1. 11
2. 1
3. 10
4. 0

Correct answer: 11

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