Q1. If two resistances R1 and R2 are connected in series, its effective resistance is 4.5 ohm and 1 ohm when connected in parallel, then the values of R1 and R2 are :
- (1) 4 ohm and 0.5 ohm
- (2) 3 ohm and 1.5 ohm
- (3) 2 ohm and 2.5 ohm
- (4) 1 ohm and 3.5 ohm