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.
H D Y S M W N B Q P O C R T B L Z V E G U F
Which is the only letter that occurs twice ?
Clearly, B occurs twice.