Posted by Rhonda on Thursday, January 27, 2011 at 6:06pm.
Steve ponders a math problem that asks for the number of handshakes if six people at a meeting shake hands just once with each other. The problem then asks for the number of handshakes if there are n people. Steve arrives at the correct answers after a couple of minutes without the use of calculator or pencil and paper.
The stage of development best illustrated in this example is ___.

Education Psychology  rub, Saturday, June 30, 2012 at 5:55pm
no sé

Education Psychology  Anonymous, Friday, November 11, 2016 at 11:19am
tg
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