21.  


M
N
O
P


Answer

 Option

Starting with the A on the left hand side, move around the shape in a clockwise spiral towards the centre. Letters advance through the alphabet in steps of 4, 5 then 6, repeating this pattern all the way around.

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22.  


M
N
O
P


Answer

 Option

As you move down, letters appear in alphabetical order, skipping those letters only written with straight lines.

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23.  


K
H
I
D


Answer

 Option

The numerical values of the letters in opposite segments of the circle always add up to 17.

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24.  


K
L
N
O


Answer

 Option

Working in columns, add together the numerical values of the first and second letters, and put the letter with the reverse alphabetical value of this sum in the bottom space.

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25.  


J
K
L
M


Answer

 Option

In each row, the product of the left and right hand numbers equals the sum of the numerical values of the three letters.

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