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Q: Find the wrong number in the series. 1, 2, 6, 15, 31, 56, 91

  • 1
    31
  • 2
    15
  • 3
    56
  • 4
    91
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Answer : 4. "91"
Explanation :

Answer: D) 91 Explanation: The difference of the two consecutive numbers are 1, 4, 9, 16, 25, 35.  This is clearly , +12, +22, +32, +42, +52,+62  Here 35 is wrong, So our wrong number is 91

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