Brain Teasers
3 by 3 Square
Take a 3 by 3 square.
The first row reads: 9, 1, 7.
The second row reads: 8, 2, 4.
The third row reads: 7, 3, ... ?
What's in the end of the last column?
The first row reads: 9, 1, 7.
The second row reads: 8, 2, 4.
The third row reads: 7, 3, ... ?
What's in the end of the last column?
Answer
1(The first column) - 2 x (the second column) = the third column.
So 7 - 2 x 3 = 1.
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