In a magic-square arrangement, the numbers 1 to 9 are placed in a 3 × 3 grid so that each row, column, and main diagonal sums to 15. The centre cell holds the number 5. The corner cells (4 corners) all hold even numbers. Find the SUM of the four corner cells.
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Worked Solution
Step 1: Numbers 1–9 contain even numbers {2, 4, 6, 8}.
Step 2: All four corners hold even numbers, and there are exactly four even numbers in 1–9.
Step 3: Sum = 2 + 4 + 6 + 8 = 20.
Answer: 20
Correct answer: 20
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