Which wire is negative on this PC fan? - Electrical Engineering Stack Exchange

I just got this PC fan and it has a 3 pin connector, I know the wire with the white stripe is positive but how can I find out which of the other two wires are negative? If you can't see the photo

Why can I use an AC power supply to spin DC PC-fans? - Electrical Engineering Stack Exchange

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Flex-A-Lite Variable Speed Controller and Relay Kit with Thread-In Temperature Sensor, Fan Controller With Temperature Probe (31163), Car Parts, Black : Automotive

How to avoid noise/stray voltage in a cable which going to carry both AC and DC current? - Electrical Engineering Stack Exchange

EZDIY-FAB RGB Dual Ring 120mm Case Fans,5V Motherboard Sync,Speed Adjustable,RGB Sync Fan with 10-Port Fan Hub X and Remote-5 Pack : Electronics

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power - How do I tell which wires are Red/Positive and Black/Negative on these fans? - Electrical Engineering Stack Exchange

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controller - H-bridge/buck converter with negative and positive voltage range - Electrical Engineering Stack Exchange

Flex-A-Lite Variable Speed Controller and Relay Kit with Thread-In Temperature Sensor, Fan Controller With Temperature Probe (31163), Car Parts, Black : Automotive

Question - Which wire should I connect resistor to?