11)Suppose that the number of bacteria in a colony triples every hour.
a)an = 3an-1
where an is the number of bacteria after n hours,
b)$a_{10}=3.a_{9}$
$\Rightarrow a_{10}=3^{10}.a_{0}$
$\Rightarrow a_{10}=3^{10}.100=5904900$
an = 3n
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