(2 votes, average: 4.50 out of 5)What number should replace the question mark?
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Its actually pretty simple
all the rows sum is 15
first row => 9 + 1 + 5 => 15
second row => 4 + 8 + 3 => 15
third row => 2 + ? + 7 => 15 => ? = 15 – 7 -2 => 6
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6 because that is the only missing number