Answer
No.
Work Step by Step
There is a path from $R_3$ back to the battery that doesn't go through $R_1$. Therefore, the resistors aren't in series.
Fundamentals of Physics Extended (10th Edition)
by Halliday, David; Resnick, Robert; Walker, Jearl
Published by
Wiley
ISBN 10:
1-11823-072-8
ISBN 13:
978-1-11823-072-5
Chapter 27 - Circuits - Questions - Page 793: 2a
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