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Directions to Solve: In each series, look for the degree and direction of change between the numbers. In other words, do the numbers increase or decrease, and by how much
Look at this series: 21, 9, 21, 11, 21, 13, 21, ... What number should come next?
  • a)
    14
  • b)
    15
  • c)
    21
  • d)
    23
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
Directions to Solve: In each series, look for the degree and directio...
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.
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Community Answer
Directions to Solve: In each series, look for the degree and directio...

Analysis:
The series alternates between 21 and a number that increases by 2 each time.

Solution:
- 21 (+12)
- 9 (-10)
- 21 (+10)
- 11 (-10)
- 21 (+10)
- 13 (-10)
- 21

Therefore, the next number should be 21 + 10 = 31.
So, the correct answer is option 15.
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Question Description
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