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Sticky Note
What is the next number in the series, 15, 45, 75, 105?
  1. 125
  2. 115
  3. 135
  4. 189
Explanation
Step 1: Find the pattern

Check the difference between consecutive terms:

  • 45 − 15 = 30

  • 75 − 45 = 30

  • 105 − 75 = 30

So the series increases by 30 each time.


Step 2: Find the next number

105 + 30 = 135



Last updated on 09-03-2026

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