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a₂=a₁*q- 2 wyraz
a₃=a₂*q=a₁*q²
a₄=a₃*q=a₂*q²=a₂*q³
a₅=a₄*q=a₃*q²=a₂*q³=a₁*q⁴
q- iloraz ciągu
a₃=4
a₅=1
układ równań:
a₁*q²=4
a₁*q⁴=1
a₁=4/q²
a₁*q⁴=1
4/q²*q⁴=1
4q²=1 /4
q²=1/4
q=1/2 lub q=-1/2
dla q=1/2
a₁=4/(1/2)²=4/(1/4)=16
dla q=-1/2
a₁=4/(-1/2)²=4/(1/4)=16