Question

What is the magic sum of a 3 x 3 magic square , whose middle number is 31​

Answer 1

Answer: 15

Step-by-step explanation:

So, in the example of the 3x3 square: sum = 3 * [(9 + 1) / 2] sum = 3 * (10 / 2) sum = 3 * (5) sum = 15. The magic constant for a 3x3 square is 15. All rows, columns, and diagonals must add up to this number.

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Answer 2

Answer:

15 is the magic sum of 3×3