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

Answer: E. Four
Letters in the word Letters in the alphabet
S  E  Q S  R  Q
Q  U  E  N Q  P  O  N
S  E  Q  U  E  N S  R  Q  P  O  N
E  N  T  I  A E  D  C  B  A