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Part ACSIR NET December 2024a-line-is-an-unordered-pair

A line is an unordered pair

Fifteen distinct points are randomly placed on the circumference of a circle. How many distinct straight lines at the most can be formed by pairs among these points?

  1. A.105✓
  2. B.455
  3. C.30
  4. D.210

You have the answer. Trap Analysis is why the other three were written.

Not a worked solution repeated four times — the specific reasoning error each wrong option was built to reward.

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