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a₃=-24
a₃=a₁*q²
-24=-6*q² /:(-6)
q²=4
q=-2 q=2
mamy dwa rozwiązania
gdy q=-2
a₂=a₁*q
a₂=-6*(-2)
a₂=12
gdy q=2
a₂=a₁*q
a₂=-6*2
a₂=-12