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q=an+1/an=const.
an=2^((n/2) - 1)
an+1=2^((n+1/2) - 1)
q=[2^((n+1/2) - 1)]/[2^((n/2) - 1)] = 2^((n+1/2) - 1)-((n/2) - 1) = 2^((n+1/2)-1-(n/2)+1) = 2^ 1/2 = const. c.n.d.
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