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Let log(ab^(3)) ,log(a^(3)b^(8)) ,log(a^...

Let `log(ab^(3))` ,`log(a^(3)b^(8))` ,`log(a^(6)b^(11))` are the first three terms of an arithmetic progression and the eighth term is `log b^n` Find the value of `70-n` (n in N)

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