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I have a rule which I want you to guess. I can tell you somethings about this rule. It's about triplets, or three numbers. The numbers are all positive (above zero) and integer (whole numbers). I will give you one triplet which obeys the rule. This is 2, 4, 6.

You are allowed to give me any numbers of triplets and I will tell you if each triplet obeys the rule or not.

You must then guess the rule.

First numberSecond numberThird number


but don't click here until you've tried it for yourself. The solution is more fun, and makes more sense, after your own attempts.