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The following combination of 28 ohm resistors has a total resistance of 42 ohm:

  a.   three resistors in series

  b.   three resistors in parallel

  c.   a combination of two resistors in parallel, then placed in series with another resistor

  d.   a combination of two resistors in parallel, then placed in series with another two in parallel
Your answer "b" is not correct. "c" is the right answer.

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