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8. What number should replace the question mark?
 
16 2 4 4
35 7 2 3
42 6 3 ?
 

Explanation:
Column 4 = (Column 1 ÷ Column 2 - Column 3). 16 ÷ 2 - 4 = 4; 35 ÷ 7 - 2 = 3; 42 ÷ 6 - 3 = 4).