Resposta :

AntoniLAD
a1=2
razão=6/2=3
n=5

[tex]sn= \frac{a1.( q^{n}-1) }{q-1} =
s5= \frac{-2.( 3^{5} -1)}{3-1} =
s5= \frac{-2.(243-1)}{2} =
s5= \frac{-2.242}{2} =
s5= \frac{-486}{2} =
s5=-243[/tex]

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