Jezeli w ciagu geometrycznym (an) pierwszy wyraz ciegu jest rowny - dwie trzecie, a drugi wynosi 2, to:
A. a4=-18
B. a4= 18
C. a4=6
D. a4=-6.
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a₁= -⅔
a₂=2
q= a₂
a₁
q= 2
-⅔
q=2·(-3/2)= -3
a₄=a₁·q³= - ⅔·(-3)³= -⅔·(-27)=18
odp B