In the following questions Pick the odd thing out
In each of the questions a sequence of numbers or letters or words or strings of letters that follow a definite pattern is given. Each question has a blank space. This has to be filled by the correct answer from the four given options to complete the sequence without breaking the pattern.
6, 11, 27, 51, ............
7, 26, 124, 342, .........
2, 3, 4, 6, 6, 9, 8, 12, 10, ...........
$$\frac{2}{3}, \frac{3}{4}, \frac{5}{6}, \frac{7}{8}, ......$$
0, 5, 8, 17, 24, ...........