Many math courses provide a few helpful formulas that may be used on tests on a formula sheet. A certain online course provider's sheet includes an interesting "formula" after some common geometric ones:
Volume of a 2-liter bottle: 2 liters
I find it difficult to imagine the circumstances that led up to that being added to the sheet. Surely it couldn't have been there from the start - I hope the test writers had faith that their students would be able to determine the volume of a 2-liter bottle from the "2-liter" part. Though, in two years of mathematics through that provider, I never once was asked a question involving a 2-liter bottle, so maybe there was a confusing question that was retired.
Interestingly, "what is the volume of a 2 liter bottle" does get auto-completed in the Google Chrome search bar after I type the 2. In the results, Google renders in bold both "2 liters" and "500 milliliters."
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