Insert the missing number: 7, 10, 9, 12, 11, _____?
- 14 and 13
- 12 and 10
- 15 and 14
- None of these
Explanation
The sequence alternates between adding 3 and subtracting 1. Following this pattern:
7 (+3) → 10 (-1) → 9 (+3) → 12 (-1) → 11 (+3) → 14 (-1) → 13.
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- 18
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- None of these
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- 1250
- 1300
- 1350
- None of these
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- 7777
- 9999
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- None of these
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