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This combination of series resistors could replace a single 120 ohm resistor:

  a.   five 24 ohm

  b.   six 22 ohm

  c.   two 62 ohm

  d.   five 100 ohm
Your answer "a" is CORRECT!

five 24 ohm = 120 ohms.
six 22 ohm = 132 ohms.
two 62 ohm = 124 ohms.
five 100 ohm = 500 ohms.

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