Hi. If you have a 3x3 grid of dots, how many different paths can you draw if you have to go through each dot? There can be crossing lines, but none overlaping.(adsbygoogle = window.adsbygoogle || []).push({});

e.g.:

158

924

637

Sorry for my formulation. I didn't copy this from somewhere, it's a practical problem.

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# How many combinations?

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