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Let f :    be a continuous function satisfying f (0) = 1 and f (2 x ) – f ( x ) = x for all x   . If n lim  n x f (x) f 2              = G(x), then 10 2 r 1 G(r )   is equal to

1. 385
2. 420
3. 215
4. 540

Correct answer: 385

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