Ciągi:
1, an= 2n/ n+1
2. a2= -4
a8= 14
a1=?
r=?
3.a1=27
a5=16/3
a2,a3,a4=?
4.a1=2
a2=7
a3=12
Sn=245
r=5
an=?
5.a1=9
a8=?
s10=?
q=2
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