BdMO National Junior 2014/5
Posted: 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?
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?