Verbal Reasoning - Mental Ability Questions

A series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.

206, 309, 412, ?, 618, 721

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
C A E, F D H, I G K, ?

If EFMIJ means DELHI, then the last letter of the word got by decoding IQBOS is

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.

8, 27, 125, 343, ?

If 19 (36) 13 and 37 (81) 28, then what is the value of 'A' in 43 (A) 38?

Determine the value of ? $$\begin{gathered} 1-121-131-14.........1-1n-? \\ \end{gathered}$$

How many such pairs of letters are there in the word REGIONAL, each of which has as many letters between them in the word (in both forward and backward directions) as they have between them in the English alphabetical series ?

The orthocentre of a triangle lies on one of the sides. Then______