11.  


P
Q
R
S


Answer

 Option

Taking the numerical value of each letter, they follow the sequence of Prime Numbers.

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12.  


P
Q
R
S


Answer

 Option

Taking pairs of letters in the inner and outer segments of each eighth of the diagram, the numerical values always add up to 20.

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13.  


P
Q
R
S


Answer

 Option

Starting with the G, move clockwise around the circle, in steps of 3 letters, then 4, 5, 6 and 7.

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14.  


N
P
H
F


Answer

 Option

Starting at the top left circle, and moving right, then down one row and moving left, in a snakes and ladders pattern, letters move through the alphabet in steps of 2, 3 and 4, repeating this pattern all the way down.

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15.  


N
S
O
F


Answer

 Option

The alphabetical value of the letters in the left hand column follows through the sequence of Prime Numbers, with the letters in the right hand column representing the corresponding reverse alphabetical values.

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