Question about basic Circuit, parallel and series connect

[kougou]

Homework Statement

if I have something looks like the photo attach, could I say that
R2 and R4 are in series?

It asks to compute the current through the R2 branch, but I am curious about these two resistors are in series or not.

Homework Equations

definition of series and parallel connect.
Series: connecting end to end
Parallel: connecting to two same node

The Attempt at a Solution

No, they are not at all in parallel

 

[lewando]

R2 and R4 are not in series and they are not parallel.