write 30 ohms or 30Ω, don't write the name of the Greek letter.
3 in series: 90Ω
2 in series, in parallel with 1: 20Ω
1 in series with 2 in parallel: 45Ω
3 in parallel: 10Ω
suppose you have 3 resistors, each of value 0f 30 omega. List all the different resistances that you can obtain by combining them
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