Education Psychology

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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 -

no sé

• Education Psychology -

tg

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