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Equivalent resistance in mixed circuits

Problem

An engineer building a Mars rover is tasked with replacing all resistor combinations with equivalent resistors to make the payload lighter. One of the circuits is shown below.
What is the equivalent resistance, R, between A and D?
R=
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • a mixed number, like 1 3/4
  • an exact decimal, like 0.75
  • a multiple of pi, like 12 pi or 2/3 pi
Ω