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Part ACSIR NET December 2024removing-a-number-that-raises-the-average

Removing a number that raises the average

The average of seven numbers is 71. If we exclude one of these numbers, the average becomes 75. What is that number?

  1. A.75
  2. B.74
  3. C.73
  4. D.47✓

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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