Vocês são demais então me ajudem mais um pouquinho ?
an=a1*q^n-1
-320=10*q^6-1
-320/10=q^5
-32=q^5
-2^5=q^5
q=-2
(10,-20,40,-80,160,-320)
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an=a1*q^n-1
-320=10*q^6-1
-320/10=q^5
-32=q^5
-2^5=q^5
q=-2
(10,-20,40,-80,160,-320)