aₙ=7-2n
a₁=7-2·1=7-2=5
a₂=7-2·2=7-4=3
r=a₂-a₁=3-5=-2
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aₙ=7-2n
a₁=7-2·1=7-2=5
a₂=7-2·2=7-4=3
r=a₂-a₁=3-5=-2