It would seem to be 11.
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Here are a couple of ways to justify the answer "11":
#1:
2 -> 6 is an increase of 4.
6 -> 3 is a decrease of 3.
3 -> 8 is an increase of 5.
8 -> 6 is a decrease of 2.
6 -> 12 is an increase of 6.
12 -> 11 is a decrease of 1.
#2:
2 -> 3 is an (odd) increase of 1.
6 -> 8 is an (even) increase of 2.
3 -> 6 is an (odd) increase of 3.
8 -> 12 is an (even) increase of 4.
6 -> 11 is an (odd) increase of 5.
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You won't read more. I had to paste the answer here from another Q because Merge was playing up. My apologies to the original answerer and editor.
9
What number best completes the sequence 1 1/2 5 10 1/2 18
13 20 12
The letter is L and the number is 12.
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.
1
(plus) + 4 (minus) - 3
The sequence appears to be alternating between addition and subtraction operations. Starting with 7, we subtract 6 to get 1, then add 4 to get 5, subtract 8 to get -3, and then add 10 to get 7. Following this pattern, the next operation would be subtraction, so we subtract 12 from 7 to get -5. Therefore, the number that best completes the sequence is -5.
2 6 3 8 6 12 2 6 3 8 6 12
11
The number that completes the sequence would be 11. Imagine the sequence as two sequences of every other number starting with the first 2 and the first 6. You would have 2 3 6 and 6 8 12 2 3 6 is adding odd numbers starting with one. 6 8 12 is adding even numbers starting with two. The next number belongs to 2 3 6 so you would add 5 to get 11.
11