a2=7
a4=1
a1=?
7=1+(7-4)d
6=3d
2=d
a1=1+(1-4)2
a1=1-6
a1=-5
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a2=7
a4=1
a1=?
7=1+(7-4)d
6=3d
2=d
a1=1+(1-4)2
a1=1-6
a1=-5