15.
9
The letter is L and the number is 12.
Not sure about completes becasue the series look like it should be infinite. The best continuation is 28, 32, ...
456445
(plus) + 4 (minus) - 3
The number which best completes the sequence below is: 2 9 5 13 10 19 17 ?
11
9
What number best completes the sequence 1 1/2 5 10 1/2 18
11
13 20 12
The letter is L and the number is 12.
Not sure about completes becasue the series look like it should be infinite. The best continuation is 28, 32, ...
2 6 3 8 6 12 2 6 3 8 6 12
15, since 15*2 = 9*2 + 12*2
1
456445