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a2=4/3-24/3=-20/3
a3=6/3-24/3=18/3
a4=8/3-24/3=16/3
a5=10/3-24/3=-14/3
a6=12/3-24/3=-12/3
.....
2/3n-8<0
2/3n<8/*3/2
n<12
dwanascie wyrazów
n²-6n+5<0
Δ=36-20=16
√Δ=4
x1=5
x2=2
x∈(2,5) czyli a2,a3,a4,a5