Dimension
Series teasers are where you try to complete the sequence of a series of letters, numbers or objects.
1,1,infinity,5,6,?
What is the next number?
HintThe title gives the clue.
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Answer
3.
In 0D, there is a dot. Nothing else. So, there is one.
In 1D, the line, is the only one.
In 2D there are infinity regular polygons
In 3D, 5 Platonic Solids appear:
tetrahedron, cube, octahedron, dodecahedron, and icosahedron.
In 4D, 6 regular polytopes show:
5cell, 8cell, 12cell, 24cell, 120cell, and 600cell.
In the fifth dimension, only the simplex, hypercube, and cross polytope are regular.
This leaves us with 3 as our answer.
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Comments
PunnettSwears
Jun 10, 2006
 Fascinating. 
Softballsweety
Jun 10, 2006
 Very tough! 
udoboy
Jun 12, 2006
 "infinity" is not a number, but I'll let you slide. 
weatherkari
Jun 13, 2006
 I don't get it. 
ChristheGreat
Jun 13, 2006
 What was that again. In 4d bubonic poles from Finland appear?

calmsavior
Jun 13, 2006
 that is tough!!!!!!! 
xxilove_ihatexx
Jun 15, 2006
 dont get it.. too confusing 4 me! 
IQ200
Mar 19, 2009
 Whoa! That was a cool one! 
eighsse
Jul 27, 2013
 Beautiful. I did not realize that there are only a few regular forms in higher dimensions, but that does make sense. Makes you think. I usually think of the dimensions as being so relative and increasing exponentially in every way, but that's really fascinating that the 3rd is the only one (as far as we've discussed, that is) with an infinite number of regular forms. 
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