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If a 2.2 megohm and a 100 kilohm resistor are connected in series, the total resistance is:

  a.   2.1 megohm

  b.   2.11 megohm

  c.   2.21 megohm

  d.   2.3 megohm
Your answer "a" is not correct. "d" is the right answer.

100 kilohms = 0.1 megohms.
2.2 + 0.1 = 2.3 megohms.

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