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Jake Glascock

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Non-Adaptive 12 Identical Balls

You're right. I read the problem too quickly and failed to account for heavy or light. Solution foiled!

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Non-Adaptive 12 Identical Balls

Label the balls A1-A6 and B1-B6.

Weigh One:

Left

  • A1
  • A2
  • A3
  • A4
  • A5
  • A6

Right

  • B1
  • B2
  • B3
  • B4
  • B5
  • B6

Weigh Two

Left

  • A1
  • A2
  • A3
  • B1
  • B2
  • B3

Right

  • A4
  • A5
  • A6
  • B4
  • B5
  • B6

Weigh Three

Left

  • A1
  • A4
  • B1
  • B4

Right

  • A2
  • A5
  • B2
  • B5

Off

  • A3
  • A6
  • B3
  • B6

Explanation: Weigh One gives you group A or B. Weigh Two gives you 1-3 or 4-6. Weigh Three gives you 1, 2, or 3 OR 4, 5, or 6.

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