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Find the WRONG number in the series: 4, 6, 9, 13, 18, 25, 31

Competition practiceNumber Series
  • A25
  • B18
  • C13
  • D31

Step-by-Step Solution

Differences should rise +2, +3, +4, +5, +6, +7 giving 4, 6, 9, 13, 18, 24, 31. So 25 is wrong; it should be 24.
Answer: A) 25

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