Missing Letter Puzzles Questions with Answers

1. Which letter replaces the blank and completes the sequence?
 
Answer
Ans = O.
Starting bottom left and moving clockwise in a spiral, letters advance by 9 places, then 8, 7, 6 etc.
2. Which letter replaces the blank and completes the sequence?
  What is the next number?
Answer
Ans = E.
In each row, subtract the numerical value of the middle letter from the left hand letter to give the right hand letter.
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