Puzzles - Missing letters puzzles

Answer

:

Y

Explanation

:

Start on the left hand of the diagram, and move clockwise. Letters are written in alphabetical order, in steps of 10 letters at a time.

Answer

:

X

Explanation

:

In each triangular shape, start on the extreme left and move in a clockwise spiral towards the centre. Letters are written in alphabetical order, in steps of 6 letters for the left hand shape, 7 letters for the centre, and 8 letters for the right hand shape.

Answer

:

B

Explanation

:

Start on the left of the diagram, and work in columns, top to bottom, from left to right. Letters are written in sequence, in steps of 2, then 4, then 6, then 8, before repeating this pattern.