First time posting, not sure if this is the right place

[tryingtounderstand]

Homework Statement

Having a hard time finding a perfect combination for desired equivelant resistance

Relevant Equations

For example if we have 4 resistors;
6 ohm/ 9 ohm/ 18ohm /12 ohm
Is there a method to combine them to equal to 6 ohm without wasting time trying different variations

This is my first time idk if i posted in the correct sub

 

[haruspex]

if we have 4 resistors;
6 ohm/ 9 ohm/ 18ohm /12 ohm
Is there a method to combine them to equal to 6 ohm

Do you have to use each exactly once?

 

[tryingtounderstand]

Do you have to use each exactly once?

Yes

 

[haruspex]

Yes

There are some tactics...
You can remove a common factor.
Look for pairs which, put in parallel, give simple equivalents.