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In the 4 × 4 array shown below, each cell of the first three rows has either a cross (X) or a number.
1 X 4 3
X 5 5 4
3 X 6 X
The number in a cell represents the count of the immediate neighboring cells (left, right, top, bottom, diagonals) NOT having a cross (X). Given that the last row has no crosses (X), the sum of the four numbers to be filled in the last row is
- 11
- 10
- 12
- 9
Correct answer: 11
Solution
Using the cross positions that make every given number consistent, the four last-row cells have non-cross neighbor counts 2, 4, 3, 2 (left to right). Their sum is 11, not 9, so the answer is 11.
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