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 Post subject: Number sequence
PostPosted: Sun Dec 08, 2013 11:23 am 
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Joined: Sun Nov 17, 2013 9:10 am
Posts: 14
13,12,13,16,12,20,12,?

2,3,4,9,8,27,?


Any help with these very much appreciated with an explanation

Thanks


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 Post subject: Re: Number sequence
PostPosted: Sun Dec 08, 2013 12:03 pm 
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Joined: Wed Jul 01, 2009 1:04 pm
Posts: 1187
They look like 2 alternating sequences

So the first one is

13, 12, 13, 16, 12, 20, 12,

So the underlined sequence goes up by adding 4 each time. The bold sequence goes down by 1 every 2nd time.

Similarly

2, 3, 4, 9, 8, 27

The bold numbers multiply by 2 each time, the italic numbers multiply by 3 each time.


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 Post subject: Re: Number sequence
PostPosted: Sun Dec 08, 2013 7:05 pm 
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Joined: Sun Nov 17, 2013 9:10 am
Posts: 14
Thanks very much :oops:


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