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Multiple choice

Find the missing number in the series. (111, 91, 72, ?, 37)

  1. $54$
  2. $55$
  3. $21$
  4. $43$
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A Correct answer
Explanation

Find the pattern in differences: 111-91=20, 91-72=19. The difference decreases by 1 each time (20, 19, 18, 17). So: 72-18=54, and 54-17=37 (which matches the last term).

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