What are the possible resistance values with only a 30Ω and 60Ω resistor?

[Sebkl23]

1. Given only one 30Ω and one 60Ω, calculate all possible values of resistance that can be obtained.



2.I am not certain of which equation I should be using ... I never had other problems which gave only this information, usually the voltage is given or the current.



3. Here is my attempt but I strongly doubt it is right.
RS = R1 + R2
RS = 30Ω + 60Ω
RS = 90Ω

 

[Fightfish]

Hint: Consider how the resistors may be connected.

 

[cartonn30gel]

Think about different combinations that you can come up with these two resistors. Try to draw those combinations. That could help.