## Bdmo National2014: junior 5

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atiab jobayer
Posts: 23
Joined: Thu Dec 19, 2013 7:40 pm

### Bdmo National2014: junior 5

A new is to be formed by removing some terms from the series 1,2,3,4..............,30 such that no term of the new series is obtained if any term of the new series is doubled. Maximum how many terms can there in new series?
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Labib
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### Re: Bdmo National2014: junior 5

First of all, there are a few minor typos.
atiab jobayer wrote:A new is to be formed by removing some terms from the series 1,2,3,4..............,30 such that no term of the new series is obtained if any term of the new series is doubled. Maximum how many terms can there in new series?
The statement, I guess, should be "A new series is to be formed by removing some terms from the series \$1,2,3,4..............,30\$ such that no term of the new series is obtained if any term of the new series is doubled. Maximum how many terms can there be in the new series?"
Here's a possible approach.
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atiab jobayer
Posts: 23
Joined: Thu Dec 19, 2013 7:40 pm

### Re: Bdmo National2014: junior 5

Yes. I've made a solution. I agree with Labib.In the new series, there must be contain 20 term. The missing numbers are : 2,6,8,10,14,18,22,24,26,30.
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