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This doesn't seem to work right for negative numbers. The article says the rule is "each number must be larger than the one before it", but if you try -2 -4 -6 it says that pattern doesn't match the rule.

Maybe I'm just being pedantic here, but last I checked -6 was larger than -4.

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"Larger" in this context means "greater than" in the usual ordering of the real numbers.

It works for floating point numbers -- 0.01 0.02 0.04 for example. So it's a geometric series that has to start with a positive number and doubles. (The submit button and the show the answer button were broken for me.)

That's unintentionally hilarious.

Yeah I was wrong in exactly the way the article expected :-)

But the submit button being broken did kind of suck.

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