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  3. the nine entries of a 3×3 grid are filled with ?1

The nine entries of a 3×3 grid are filled with ?1, 0, or 1. Prove that...

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Advance Math

The nine entries of a 3×3 grid are filled with ?1, 0, or 1.Prove that among the eight resulting sums (three columns, threerows, or two diagonals) there will always be two that add to thesame number.

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There are possible sums and they areThese are obtained when a place    See Answer
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