Answer : M
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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Answer : O
Explanation : In each segment of the diagram are a pair of letters, one of which is the same distance from the start of the alphabet as the other is from the end.
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Answer : K
Explanation : The numerical values of the letters in opposite segments of the circle always add up to 17.