Two resistance r1 and r2 is combined resistance 4.5 ohm and 12 when they are connected in series and parallel
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Series
R = R1 + R2
R = 4.5 + 12
R = 16.5 ohm
Parallel
R = 1/R1 + 1/R2
R = 1/4.5 + 1/12
R = 12 + 4.5 / 54
R = 16.5/54
R = 0.31 ohm (approximately)
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