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

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tachometer - 3-wire fan: Minimum supply voltage for Tach signal? - Electrical Engineering Stack Exchange

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

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