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Sticky Note
What is the 3rd arithmetic mean out of 4 arithmetic means inserted between 18 and 3?
  1. 6
  2. 9
  3. 12
  4. 15
Explanation

The common difference is −3-3, so the sequence becomes:
18,15,12,9,6,318, 15, 12, 9, 6, 3
The 3rd mean is the 4th term: 9.

Related MCQs

The race started at 9:00, and the second winner took 10 minutes more than the first arrived at the goal at 9:55 hours. How much time (in minutes) did the first winner?
  1. 40
  2. 45
  3. 50
  4. 55
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