If for all values of \( x \& y ; f(x+y)=f(x) \cdot f(y) \) and \( f...

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If for all values of \( x \& y ; f(x+y)=f(x) \cdot f(y) \) and \( f(5)=2, f^{\prime}(0)=3 \), then \( f^{\prime}(5) \) is-
(1) 3
(2) 4
(3) 5
(4) 6
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