How would one connect three 9Ω resistors to get 12Ω?

[bpani]

how would one connect three 9Ω resistors to get 12Ω??

Statement
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how would one connect three 9Ω resistors to get 12Ω??

equations
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i guess the relevant equations would be nothing more than series & parallel resistance connections..


The attempt at a solution
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I've tried all possible ways to connect them (only 4 diff ways I guess??). There is apparently a solution since its in my nephew's textbook.

 

[berkeman]

Statement
-----------
how would one connect three 9Ω resistors to get 12Ω??

equations
-----------
i guess the relevant equations would be nothing more than series & parallel resistance connections..


The attempt at a solution
-------------------------
I've tried all possible ways to connect them (only 4 diff ways I guess??). There is apparently a solution since its in my nephew's textbook.

Hint -- you are going to have to cut the resistors in half with a fine saw...

 

[alan2]

I can do it with 4. Are you sure you read the problem correctly?

 

[alan2]

But I like Berkeman's answer better.