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darkdantedevil · 3463 days ago · link · · parent · post: A Quick Puzzle to Test Your Problem Solving.
I'm not sure if you're joking, but if you guess a few times then type your answer, the website will tell you the rule. The rule is, the numbers must get larger. Not by any set amount, just larger. 1, 2, 3 will work, but so will 1, 20, 300.