Find the missing number in the series: 1, 7, 3, 9, 6, 12, 10, 16, 15, ?
Correct answer: C. 21
- A. 18
- B. 15
- C. 21
- D. 20
Explanation
This is an alternating series. The first series (1, 3, 6, 10, 15) increases by +2, +3, +4, +5. The second series (7, 9, 12, 16) increases by +2, +3, +4. The next term belongs to the second series, so it is 16 + 5 = 21.
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