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# math/ intellegence puzzle

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Showing 1-6 of 6 posts in this discussion
Initial post: Dec 10, 2011 1:30:10 PM PST
D. Stern says:
In an article on intelligence testing, I came across the following problem: Supply the missing fifth number in the following sequence: 56,35,20,10,__,1. The correct answer is one of the following: 2,3,4,5,6, or 7, but the article does not indicate the answer or the nature of the sequence from which one could derive the answer. I have been unable to answer the problem. Any solution?
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In reply to an earlier post on Dec 10, 2011 1:48:40 PM PST
4 Pascal's triangle

In reply to an earlier post on Dec 10, 2011 11:00:58 PM PST
D. Stern says:
Thank you.

Posted on Feb 21, 2012 7:02:06 PM PST
Last edited by the author on Feb 21, 2012 7:03:22 PM PST
Kim says:
This is not pascal's triangle.
First differences are: 3, 6, 10, 15, 21
Second differences are 3, 4, 5, 6, etc.
Third differences are all 1.

Take the 5 points x=0, x = 1, x = 2, x = 3, x = 4 then the equation is:
y = (x^3)/6 + (x^2) + 11x/6 + 1.

Posted on Feb 27, 2012 11:32:51 AM PST
Kim says:
I would love to see the entire article.

In reply to an earlier post on Feb 27, 2012 7:49:55 PM PST
D. Stern says:
The article is "intelligence: measurement," pp. 475-478 in The Oxford Companion to the Mind, 2ed. 2004.
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## This discussion

Discussion in:  Education forum
Participants:  3
Total posts:  6
Initial post:  Dec 10, 2011
Latest post:  Feb 27, 2012