Question

which resistor is in parallel and in series

Answer 1

r3 and r4 are in series and r1 and r2 are in series
and both their combination are in parallel...
this may help u..........

Answer 2

Resistor R1 and R2 are in series
Also, Resistor R3 and R4 are in series
And, resistor R12 and R34 are in parallel

Hope it help