BdMO National Junior 2007/10

Discussion on Bangladesh Mathematical Olympiad (BdMO) National
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samiul_samin
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Joined:Sat Dec 09, 2017 1:32 pm
BdMO National Junior 2007/10

Unread post by samiul_samin » Sun Feb 24, 2019 8:58 am

Find the sum of first $20$ terms of the series $4+7+13+25+...$
What is the sum of first $n$ terms?
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