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[quad a(1),a(2),a(3),...quad " are "quad...

[quad a_(1),a_(2),a_(3),...quad " are "quad " in "quad GP,quad " then "],[log a_(n)quad log a_(n+1)quad log a_(n+2)|],[log a_(n+3)quad log a_(n+4)quad log a_(n+5)|" is equal to "],[log a_(n+6)quad log a_(n+7)quad log a_(n+8)|],[0quad " b."1],[" 2"quad " d."4]

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