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Hi mjbreddy, you already got correct reply from crushow, when you ask what are Vo1 when Vin is 5V, 3V, 2.5V and 0V.
Another question should be, what would be operating region for transistor across voltage range you specified?
Answer is transistor remain off until Threshold voltage(at gate), and goes to triode region when higher than threshold voltage.
It never goes to saturation.!!!