a. Think of a number.
Add 17.
Double the result.
Subtract 4.
Double the result.
Add 20.
Divide by 4.
Subtract 20.
Your answer will be your original number. Explain how this trick works.
b. Fill in two more steps that will take you back to
your original number.
Think of a number.
Add 18.
Multiply by 4.
Subtract 7.
c. Make up a series of instructions such that you will always get back to your original number.
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