Not a kata issue!
Take the 2nd row and 2nd col number for example (1)
1
2nd row sum --> 8
8
2nd col sum --> 6
6
So, the answer is 8 + 6 - 1 --> 13
8 + 6 - 1
13
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Not a kata issue!
Take the 2nd row and 2nd col number for example (
1
)2nd row sum -->
8
2nd col sum -->
6
So, the answer is
8 + 6 - 1
-->13