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![[Post New]](/templates/default/images/icon_minipost_new.gif) 23 Dec 2007 13:24:24 IST
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Each term can be simplified as [ 2/3(10n) + 1/3 ]2
or [( 2x10n +1)/3]2 .
2x10n +1 is divisible by 3 as the sum of the digits is 3. Hence the answer
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