BdMO National Junior 2014/5

Discussion on Bangladesh Mathematical Olympiad (BdMO) National
samiul_samin
Posts:1007
Joined:Sat Dec 09, 2017 1:32 pm
BdMO National Junior 2014/5

Unread post by samiul_samin » Fri Feb 16, 2018 3:19 pm

A new series is to be formed by removing some terms from the series $1,2,3,4,.........,30$
such that no terms of the new series is obtained if the new series is doubled.Maximum how many terms can be in the new series?

samiul_samin
Posts:1007
Joined:Sat Dec 09, 2017 1:32 pm

Re: BdMO National Junior 2014/5

Unread post by samiul_samin » Fri Feb 16, 2018 3:20 pm

Hint
Use a Table
Answer
$20$

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