16.  


M
N
B
C


Answer

 Option

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

 Option

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

 Option

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

 Option

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

 Option

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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