Puzzles - Missing letters puzzles

Answer

:

N

Explanation

:

Starting at the top left hand of every diagram, move around the outer circles in an anti-clockwise direction. Letters are written in alphabetic sequence, in steps given by the numerical value of the central letter.

Answer

:

E

Explanation

:

Starting on the left, and moving to the right, letters are written in alphabetical order, moving forward 8 places, then back 2, then forward 7 places and back 3. Repeat this sequence to the end of the line.

Answer

:

W

Explanation

:

Start with A on the left hand side, and move in a clockwise spiral around the diagram. Letters advance through the alphabet in steps of 6.