এখানে, সাধারণ অনুপাত, r = 2; a = 12. n তম পদ = arn-1
শর্তমতে, arn-1=82
=12×2n-1=82 =(2)-1×(2)n-1=(2)7 [∵82=2×2×2×2=(2)7] =(2)n-2=(2)7 =n-2=7 ∴n=9
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