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a₇=-96
an=a₁*q^(n-1)
a₇=a₁*q⁶
-96=-3*q⁶
32=q⁶
q=⁶√32
Sn=a₁*(1-q^n)/(1-q)
Sn=-3*(1-(⁶√32)^n)/(1-⁶√32)
jeśli pomogłem, liczę na naj;)