Hard Puzzles Questions and Answers

3. Which numbers complete the last two grids?
 
Answer
A = 7, B = 9
The difference between the first and third columns as a 4 digit number going down is written in the central column going down.
4. Which number goes in the middle?
 
Answer
17
Moving diagonally downwards from left to right, numbers increase by the same amount each line.
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