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a₇=a₁·r⁶
Reemplazando valores en:
a₃·a₇=1256
(a₁·r²)(a₁·r⁶)=1256
a₁²·r⁸=1256
Si la P.G. tiene 9 términos:
a₁·a₉=a₁(a₁·r⁸)=a₁²· r⁸
Remplazando valores en:
a₁·a₉=a₁²· r⁸
a₁·a₉=1256