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Question

What should come at the place of question mark?
2, 5, 10, 17, 26, ?

This question was previously asked in
SSC CGL 2025 Tier 2 Paper 1 Question Paper (19-Jan-2026)
The correct answer is
37

To solve this problem, we need to identify the pattern followed by the given sequence: 2, 5, 10, 17, 26, ?

  1. First, check the differences between consecutive numbers:
    • 5 - 2 = 3
    • 10 - 5 = 5
    • 17 - 10 = 7
    • 26 - 17 = 9
  2. Now, observe that the differences (3, 5, 7, 9) form an arithmetic sequence with a common difference of 2.
  3. The next difference in this sequence would be \(9 + 2 = 11\).
  4. Add 11 to the last number in the original sequence (26) to find the missing number: \(26 + 11 = 37\).

Therefore, the number that should come in place of the question mark is 37.

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Similar Questions

  1. Which number breaks the pattern? 

    3, 6, 11, 20, 33, 70

  2. What should come in place of the question mark '?' in the following number series?
    $45, 40, 50, ?, 55, 30$
  3. Complete the series.
    $25, 36, 49, 64, 81, ?$
  4. What should come at the place of question mark? : $98, 90, 82, 74, ?, 58$
  5. What should come at the place of question mark? 1, 8, 27, 64, 125, ?, 343
  6. The series given below contains a sequence of numbers. Accordingly identify the incorrect combination.
    5, 9, 27, 31, 94, 97, 292
  7. Complete the series: 0, 7, 26, 63, ?
  8. What should come in place of the question mark '?' in the following number series?

    12, 6, 0, -6, ?, -18
  9. Complete the series.
    10, 20, 18, 36, 34,68 ________

  10. If
    2 = 12
    3 = 36
    4 = 80
    5 = 150
    6 = 252
    7 = 392
    Then 8 = ?

Important Questions from Number Series

  1. What will come in place of question mark (?) in the following number series?

    2, 5, 11, 23, 44, 77, ?

  2. What will come in place of question mark (?) in the following number series?

    31, 32, 36, ?, 61, 86

  3. What will come in the place of question mark (?) in the following number series?

    3, 6, 18, ?, 630, 6930

  4. What should come in place of the question mark ‘?’ in the following number series?

    60, 40, 50, ?, 180, 460

  5. A series is given with one term wrong. Select that wrong term from the given alternatives.

    J12, M24, P48, S96, U192

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