a₁=2, a₃=8
a₃=a₁+2r
8=2+2r
2r=6
r=3
a₂=a₁+r
a₂=2+3
a₂=5
㏒₁₂x=5
x=12⁵
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a₁=2, a₃=8
a₃=a₁+2r
8=2+2r
2r=6
r=3
a₂=a₁+r
a₂=2+3
a₂=5
㏒₁₂x=5
x=12⁵