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Each of the 9 cells in the 3x3 grid below is to be filled with the number -1, 0 or 1. Prove that among the

Each of the 9 cells in the 3x3 grid below is to be filled with the number -1, 0 or 1. Prove that among the 3 row-sums, 3 column-sums and 2 diagonal-sums, there are two sums that are equal in value. [3 marks]

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