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a1=2
6=2+(2-1)*r => 6=2+r => r=4
an=2+(n-1)*4 => an=4n-2
spr. dla an=4 an=4*4-2=14
an=a1*q^(n-1)
a1=1
3=q^(2-1) => 3=q
an=3^(n-1)
spr dla an=4 => an=3^3=27
A)an=4n-2
B)an=3^(n-1)