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Suppose f : R → (0,  ) be a differentiable function such t hat 5 f ( x + y ) = f ( x )  f ( y ) ,   x , y   R . If f

1. = 320, then   5 0 n ) n ( f is equal to
2. 6825
3. 6525
4. 6875 (4) 6575

Correct answer: = 320, then   5 0 n ) n ( f is equal to

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