21.

H
I
J
K

```Answer

Answer: Option  A Explanation: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.

B
I
K
H

```Answer

Answer: Option  D Explanation:In each row of the diagram, the numerical values of the letters add up to 26. ```

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23.

W
I
F
Y

```Answer

Answer: Option  B Explanation:Starting on the left, and moving downwards in column from left to right, letters are written in alphabetical sequence,
in steps of 4 letters at a time. ```

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24.

I
J
K
L

```Answer

Answer: Option  A Explanation:Letters are arranged in each square in alphabetical order, skipping 5 letters at a time. The letter
bounded by the central square carries on this sequence, but using the reverse alphabetical value. ```

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25.

E
B
H
I

```Answer

Answer: Option  D Explanation:Convert each letter into its numerical value, and read each row as a 3 digit number.
Rows follow the sequence of Square Numbers from 15 to 17. ```

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