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a₆=6
a₂,a₃,a₄=?
a₅+r=a₆
13+r=6
r=-7
a₂=a₆-4r
a₂=6+28=34
a₃=34-7=27
a₄=27-7=20
r=a8-a5
r=6-13
r=-7
a4=a5-r
a4=13-(-7)
a4=20
a3=27
a2=34
a2=? r= -7
a6=a1 * 5r
6=a1 + 5*(-7)
a1=41
a2=a1+r
a2=41-7=34
a3=34-7=27
a4=27-7=20
a5=20-7=13