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r=a2-a1=a3-a2...
r=-1-2=-3
an=2-3(n-1)=2-3n+3
Odp. an=-3n+5
a2=a1+(2-1)*r = a1+r
-1=2+r / -2
r=-3
an=a1+(n-1)*r
an=2+(n-1)*(-3)=2-3n+3 = 5-3n
an=5-3n