Puzzles - Missing letters puzzles

Exercise : Missing letters puzzles
10.
Answer
:
P
Explanation
:
Starting at the top left circle, and moving right, then down one row and moving left, in a snakes and ladders pattern, letters move through the alphabet in steps of 2, 3 and 4, repeating this pattern all the way down.

11.
Answer
:
1
Explanation
:
Working from left to right, letters in corresponding segments of the circles move through the alphabet in steps of 2, 3 and 4, with their relative positions moving one place clockwise at each step.

12.
Answer
:
V
Explanation
:
Starting at the top left, and moving anti-clockwise around the figure, letters advance through the alphabet 5 letters at a time.