Engineering Another Parallel/Series Circuits Question

[eatlsep]

http://imgur.com/6NTHcSe
2. Rtot=R1+R2+R3...+Rn.
2a. 1/Rtot=1/R1 + 1/R2 + 1/R3...+1/Rn. 3. Not sure if I'm starting in the right place. I think R1 and R4 are in parallel combining them to take R4s position. Then R3 and R2 are in parallel.

 

[CWatters]

Redraw the circuit with nodes A anc C on the left.

Some hints..

R5 connects A to C
R4 is indeed parallel with R1 so replace R4 with R4//R1

R3 and R2 are in parallel

No. R4//R1 is in series with R2 and they are both in parallel with R3

R6 and R7 are in parallel.