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n= 3-2*1
a₁=1
obliczam a₂:
a₂=3-2*2
a₂=3-4
a₂=-1
obliczam a₃:
a₃=3-2*3
a₃=3-6
a₃=-3
r:
-1-1= -2
-3-(-1)=-2
odp d