What is the equivalent resistance of this circuit?

[SammyS]

I know its too late to reply to this thread now. I thought instead of creating a new thread, I will complete this one.

Thanks ehild, your trick was really helpful for the first question.

I gave a try to the second question but got stuck at the last step. The circuit is symmetrical about the line AB so I folded it and transformed it to as shown in the attachment. Now I am unable to proceed ahead. :(

EDIT: I have figured it out. It was easy once I applied the delta-Y transform. Thanks once again.

Yes.

There is a Δ with three equal resistances. That's easy to convert to a Y .