Number of lettters skipped in between adjacent letters in the series increases by one.
Which of the following series observes this rule ?

D. IKNRW

If it is possible to form a word with the first, fourth, seventh and eleventh letters in the word 'SUPERFLUOUS', write the first letter of that word. Otherwise, X is the answer.

B. L

In each of the following questions, find which one word cannot be made from the letters of the given word. TOURNAMENT

C. MANOUEVRE

In each of the following questions, find which one word cannot be made from the letters of the given word. OBSTETRICIAN

D. TERMITE

How many pairs of letters are there in the word 'SEQUENTIAL' which have as many letters between them as are in the alphabet ?  

E. FOUR