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# Let $f$ be a non-zero real valued continuous function satisfying $f(x+y)=f(x).f(y)$ for all $x,y \in R.$ If $f(2)=9,$ then $f(6)=$

$(a)\;3^2 \quad (b)\;3^6 \quad (c)\;3^4 \quad (d)\;3^3$
Can you answer this question?

(b) $3^6$
answered Nov 7, 2013 by