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Puzzles - Missing letters puzzles

Exercise : Missing letters puzzles
151.
Answer
:
P
Explanation
:
Starting in the top left corner and moving clockwise in a spiral towards the centre, letters follow the alphabetic sequence, skipping 5 letters at a time, written in alternate squares of the diagram.
152.
Answer
:
C
Explanation
:
The sum of the numerical values of pairs of letters, opposite each other in the diagram, is always 20 (the numerical value of the central letter).
153.
Answer
:
M
Explanation
:
In each diagram, start with the upper left box, and move anti-clockwise around the others. Letters advance through the alphabet in steps of 7 for the upper left diagram, 8 for the middle, then 9, then 10.
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