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
18
27. But that continues the sequence, it does not complete it.
The number which best completes the sequence below is 20 5 30 6 42 7
The best choice for the next term after those shown is 75 .We have no way to know whether or not that will 'complete' the sequence.
The number which best completes the sequence below is:2 9 5 13 10 19 17?
We can't answer this accurately without knowing the sequence.
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.
The next number is 70.The sequence is the central spine numbers of Pascal's Triangle (see related link and related question below).
7
There is no way to answer or explain any of that without seeing the sequence. We may be brilliant but we're not clairvoyant.