16.  


B
C
E
F


Answer

 Option

Moving from left to right, letters move though the alphabet in sequence, skipping 12 letters, then 11, 10, 9, 8 etc.

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17.  


E
F
G
H


Answer

 Option

Starting with the top segment of the top left square and moving clockwise around the other 3 squares, letters move through the alphabet in steps of 2, with the positions moving one place clockwise each time. Letters in the next segment of the top left square follow the same pattern, in steps of 3 letters etc.

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18.  


Z
D
E
G


Answer

 Option

The numerical values of the letters in each row and up to 26 each time.

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19.  


G
H
I
J


Answer

 Option

Following lines of circles across all 3 diagrams, letters in the top line follow the alphabetic sequence, in steps of 4 letters at a time. Letters in the central line advance 5 letters, and in the bottom line, 6 letters.

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20.  


E
F
G
H


Answer

 Option

Starting with A and C, as you move clockwise, the numerical value of the next letter equals the sum of the preceding two letters.

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