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Missing letter

(First row: Z,Y,A) (Second row: D,A,C) (Third row: D,B,B) (Fourth row: C,A,?)

Convert each letter to its numerical equivalent in the alphabet

The third column is the result of a mathematical operation (such as +, −, ×) on the first two columns.

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Morethanwordssays...

Convert each letter to its numerical equivalent in the alphabet, e.g., the letter 'Z' is assigned the number '26'. For each row, subtract the second column from the first column to calculate the third column.

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