Can you guess the rule?


Try this quick brain-teaser to test your critical thinking skills – and learn about a pernicious cognitive bias.

Let's play a game! All you need to start are these three numbers:

These numbers aren't random: they follow a secret rule. Our rule isn't constrained to just these three numbers: some number sequences - but not all - also obey it. Think you can figure out what our rule is?

You may have a hypothesis already, but (like any good scientist) you should gather some data first. Use the boxes below to try out other number sequences that you think also follow our rule. Test as many sequences as you'd like.

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