Select the missing number from the given responses:

Study the pattern and identify the missing number:

Find the missing number in the series:

5 15 9 ? 11 33 13 39

Find the missing term in given series ?

4, 6, 9, $13\frac{1}{2}$, _________ ?

How many 7s immediately preceded by 6 but not immediately followed by 4 are there in following series

7, 4, 2, 7, 6, 4, 3, 6, 7, 5, 3, 5, 7, 8, 4, 3, 7, 6, 7, 2, 4, 0, 6, 7, 4, 3

Arrange the statements in proper logical sequence.

A. The pattern continues by multiplying the number by 3.

B. Therefore, The next number must be 324.

C. The given series is 4, 12, 36, 108, ?

D. Middle term is the geometric mean of its previous and next term.

Choose the correct answer from the options given below:

Which letters exactly are midway between F and S in the English alphabet?