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In this type of questions, you are given alphabets from A to Z. The position of a letter is given in the form of a puzzle. The candidate is required to find yhis letter. However, sometimes a random letter series is given and the candidate is required to find out how many times a letter satisfying the conditions specified in the question, occurs.

In the following series, count each N which is immediately followed by X but X is not immediately followed by T. How many such N's are there ?
N  X  N  T  Q  M  N  X  T  M  X  N  X  C  N  Q  M  N  N  X  Q  N  X  T  X  N  A  M  X  N  X  M

Option:
A. 2
B. 4
C. 5
D. 7
E. 9
Answer: B . 4

Justification:

X  N  T  Q  M  N  X  T  M  X  N  X  C  N  Q  M
N  X  Q  N  X  T  X  N  A  M  X  N  X  M

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