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27. But that continues the sequence, it does not complete it.
The answer will depend on where in the sequence the missing number is. It is not clear whether the dash is used as a minus sign or to separate numbers in the sequence.
The number which best completes the sequence below is:1 1 3 2 4 6 5 25 ?
The sequence appears to alternate between adding and subtracting numbers. The pattern seems to be +11, -7, +5, -2, +6. Following this pattern, the next number in the sequence would be +3 from the previous number, which would be 21.
27