Puzzles - Missing letters puzzles

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.

Answer

:

L

Explanation

:

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

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.