An infinite number of functions share these two data points. There are too many rules that turn the input of 1 into the output 2 and the input of 2 into the output of 4. The rule could be as complicated as Mr. Lewis's rule from Session 2, or it could be as simple as the house numbers on the left side of your street.
Some examples: y = 3x-1 + 1; y = n (n + 1) / 2 + 1; y = the date number, every other day, starting with January 2.
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