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a₃=6 i a₅=54,
a₅=a₃*q*q
54=6*q² |:6
q²=9
q=3
a₁=2/3
Wzór:
an = 2/3 • 3 (do n − 1)
b) a₄=4 i a₇=8√2.
a₇=a₄*q*q*q
8√2=4*q³ |:4
q³=2√2
q=√2
a₁=√2
Wzór:
an = √2 • √2 (do n − 1)