21.  


H
I
J
K


Answer

 Option

Start at the top and move down, taking single letters or pairs of letters that appear on the same horizontal line. The sum of the numerical values of the letters in each line increases by 2 as you go down, from 18 to 26.

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22.  


A
S
O
U


Answer

 Option

Start on the centre left of the diagram, and move in a clockwise spiral towards the centre. Letters advance through the alphabet in steps of 2, 3, 4, etc.

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23.  


A
B
C
D


Answer

 Option

Start on the far left of the diagram and move around it in a clockwise direction. Letters advance through the alphabet in steps of 8 then 9, repeating this pattern all the way around.

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24.  


R
S
T
U


Answer

 Option

Starting at F and moving anti-clockwise, letters move through the alphabet in step of 2, 3, 4, 5 etc.

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25.  


U
V
W
X


Answer

 Option

Starting at the top left and moving down, then right one column and up etc in a snakes and ladder pattern, letters move through the alphabet 4 letters at a time.

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