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The function f(x) is defined for all real x, if f(x + y) = f (xy/4)∀ x, y and f(-4) = -4  then f(2011) is

(A) 2010 

(B) 2012 

(C) 4 

(D) – 4

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Correct Option:-  (D) – 4

Explanation :- 

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