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This exercise on "doing and undoing" will be our first look at functions.
Read through the examples of things that can be done and undone, and things that cannot be undone.
Groups: Discuss the examples as a large group. You may want to discuss the number puzzle that cannot be undone. Then, take five minutes to discuss Problems A2 and A3 in pairs.
<< back to Part A: Doing and Undoing
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