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Home Logical Reasoning Number Series Comments

  • Question
  • Look at this series: 21, 9, 21, 11, 21, 13, 21, ... What number should come next?


  • Options
  • A. 14
  • B. 15
  • C. 21
  • D. 23

  • Correct Answer
  • 15 

    Explanation
    In this alternating repetition series, the random number 21 is interpolated every other number into an otherwise simple addition series that increases by 2, beginning with the number 9.

  • Number Series problems


    Search Results


    • 1. Look at this series: 53, 53, 40, 40, 27, 27, ... What number should come next?

    • Options
    • A. 12
    • B. 14
    • C. 27
    • D. 53
    • Discuss
    • 2. Look at this series: 22, 21, 23, 22, 24, 23, ... What number should come next?

    • Options
    • A. 22
    • B. 24
    • C. 25
    • D. 26
    • Discuss
    • 3. Look at this series: 36, 34, 30, 28, 24, ... What number should come next?

    • Options
    • A. 20
    • B. 22
    • C. 23
    • D. 26
    • Discuss
    • 4. Look at this series: 7, 10, 8, 11, 9, 12, ... What number should come next?

    • Options
    • A. 7
    • B. 10
    • C. 12
    • D. 13
    • Discuss
    • 5. Look at this series: 2, 1, (1/2), (1/4), ... What number should come next?

    • Options
    • A. (1/3)
    • B. (1/8)
    • C. (2/8)
    • D. (1/16)
    • Discuss
    • 6. Look at this series: 58, 52, 46, 40, 34, ... What number should come next?

    • Options
    • A. 26
    • B. 28
    • C. 30
    • D. 32
    • Discuss
    • 7. Look at this series: 3, 4, 7, 8, 11, 12, ... What number should come next?

    • Options
    • A. 7
    • B. 10
    • C. 14
    • D. 15
    • Discuss
    • 8. Look at this series: 8, 22, 8, 28, 8, ... What number should come next?

    • Options
    • A. 9
    • B. 29
    • C. 32
    • D. 34
    • Discuss
    • 9. Look at this series: 31, 29, 24, 22, 17, ... What number should come next?

    • Options
    • A. 15
    • B. 14
    • C. 13
    • D. 12
    • Discuss
    • 10. Look at this series: 1.5, 2.3, 3.1, 3.9, ... What number should come next?

    • Options
    • A. 4.2
    • B. 4.4
    • C. 4.7
    • D. 5.1
    • Discuss


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