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If f(x + y) = f(x)f(y) and ∑\limits_x = 1^\infty f\left( x \right) = 2 , x, y \in N, where N is the set of all natural number, then thevalue off\left( 4 \right) \over f\left( 2 \right) is : | Watch the step-by-step video solution for this NIMCET PYQ.