Puzzles - Missing letters puzzles

Exercise : Missing letters puzzles
211.
Answer
:
D
Explanation
:
Start with the H in the top left segment, and move clockwise around the shape, alternating between outer segment then inner segment. Letters advance through the alphabet 6 letters at a time.

212.
Answer
:
L
Explanation
:
Starting with H and moving anti-clockwise, letters advance through the alphabet in steps of 10, then 8, then 6 etc.

213.
Answer
:
J
Explanation
:
As you move down, add the number of straight lines in the first letter to the numerical value of that letter to give the next one down.