Posted by Chris on Thursday, September 8, 2011 at 8:44pm.
How many two block towers can you make from: 1 black block,1 red block, and 1 blue block? Please explain.

Math  PsyDAG, Friday, September 9, 2011 at 11:50am
Assuming that the position of the blocks is important, here are the following possibilities. If not, only half are needed.
Black, red
Black, blue
red, black
red, blue
blue, red
blue, black