Some 2-4-6 problems

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The sequence [2, 4, 6] is valid. Test other sequences to discover what makes a sequence valid. When you think you know, write down your guess, reveal the rule, and see how it compares.

(You should try to deduce the truth using as few tests as possible; however, your main priority is getting the rule right.)


You can play my implementation of the 2-4-6 problem here (should only take a few minutes). For those of you who already know the solution but still want to test your inductive reasoning skills, I’ve made some more problems which work the same way but apply different rules.