hard · GMAT Quant

An automated shuttle moves along a linear track with marked stations labeled 0 through 11 in a continuous loop, where station 0 immediately follows station 11. If the shuttle starts at station 3 and advances exactly 7 stations per step, after

How many steps will the shuttle return to station 3 for the first time?

  1. 4
  2. 7
  3. 12
  4. 21
  5. 84

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