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Show that (1+3^(- 1))(1+3^(- 2))(1+3^(-...

Show that `(1+3^(- 1))(1+3^(- 2))(1+3^(- 4))(1+3^(- 8)).........(1+3^(-2^n))=3/2(1-3^(-2^((n-1))))` .

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