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a1
a2 = a1+r
a3=a2+r = a1+2r
a6= a1+5r
a1+5r=13
a1+2r=7
odejmuje stronami
a1+5r-a1-2r=13-7
3r=6
r=2
stad 7=a1+4
a1=3
a2=5
a3=7
a4=9