Two resistances R1 and R2 give combined resistance of 4.5 ohms when in series and 1 ohm when in parallel. The resistances are

1
2 ohms and 2.5 ohms
2
4 ohms and 0.5 ohms
3
1.5 ohms and 3 ohms
4
5 ohms and 0.5 ohms

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