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

Find the missing term in given series:

1, 9, 25, 49, 81, ?, 169

From the given series, which is the Arithmetic Progression (AP)?

A. 7, 18, 29, 40, ...

B. 3, 13, 23, 33, ...

C. 3, -8, -3, 18, ...

D. 2, -2, -6, -10, ...

Choose the correct answer from the options given below:

Find the term which doesn't fit into the series given below:

H4Q, K10N, N20K, Q43H, T90E

Which of the following list of numbers is/are in Geometric Progression (GP)?

(A) 6, 18, 54, 162...

(B) 2, 6, 18, 25...

(C) 3, 9, 27, 81...

(D) 4, 12, 36, 108, ...

Choose the correct answer from the options given below:

Find out the missing (?) number and letter.

In the given question, a letter-number series is given with one or more terms missing as shown by (?). Choose the missing term out of the given alternatives.

A196, I169, P144, V121, A100, ...?...