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The next number in the series is 1/5, 1/9, 1/13, 1/17

Question: The next number in the series is 1/5, 1/9, 1/13, 1/17
  • A. 1/19
  • B. 1/20
  • C. 1/21 ✓
  • D. 1/24
Correct Answer: C. 1/21
Explanation: Common difference in denominators: +4 → next is 17+4 = 21 → 1/21

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