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a3=-12 a4=24 a2=6 a1= - 3
q= 24/ -12 = -2
an= -3 * (-2) do n-1
b)
a2= -27 a5= - 8
-27 * q do 3 = -8
q do 3= -8/-27
q= -2/3
a1=40 i 1/2
an=40 i 1/2 * -2/3 do n-1
2.
a1=√5 q=√5
Sn= √5 * 1-(√5) do 5 / 1 - √5