Find the missing number in the series: 5, 7, 8, 10, 11, __, 13
- 12
- 4
- 15
- 16
Explanation
The given series is:
5, 7, 8, 10, 11, __, 13
Let’s look at the pattern:
- 5 → +2 → 7
- 7 → +1 → 8
- 8 → +2 → 10
- 10 → +1 → 11
- 11 → +2 → 13
But 13 is at the end, so the missing number must be between 11 and 13.
So we should insert +1 → 12 before +1 to get 13.
Correct answer: A) 12
Pattern: +2, +1, +2, +1, +2, +1..
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