16.

M
N
B
C

```Answer

Answer: Option  A Explanation:Working in rows, add together the numerical values of the left and right hand letters to
give the numerical value of the central letter. ```

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17.

M
N
O
P

```Answer

Answer: Option  C Explanation:In each segment of the diagram are a pair of letters, one of which is the same distance from the start of
alphabet as the other is from the end. ```

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18.

M
P
T
Q

```Answer

Answer: Option  C Explanation:Working through the diagram in columns, left to right, The sum of the numerical values of the
letters in each column follows the sequence 17, 18, 19 and 20. ```

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19.

M
N
O
P

```Answer

Answer: Option  C Explanation:In each row, letters follow the alphabetic sequence, in steps of 4 letters each time for the first row,
5 letters for the second, then 6, 7 etc. ```

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20.

M
N
P
T

```Answer

Answer: Option  D Explanation:Starting on the top left, and moving in an anti-clockwise spiral towards the centre, letters advance
through the alphabet by 3 letters at a time. ```

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