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add all the numbers in the selection and get a sum total
divide that sum by the number of numbers in the selection and that is the average
for example the numbers are from 1 to 10 inclusive = sum total=55
divide 55 by the number of numbers --(10) = 5.5 = average
I don't think you can do it! Could you check your numbers.
If we are using the numbers 1-9 once and only once in a 3x3 magic square, the sum of the rows + the sum of the columns should be 90, since 1+2+3+4+5+6+7+8+9 in the rows adds up to 45 and 1+2+3+4+5+6+7+8+9 in the columns adds up to 45.
When trying to solve, the magic number seem to be the sums 24 and 10. To get 24, the only three numbers that add to 24 are 7 + 8 +9. Similarly to get 10, the lowest numbers re 1 and 2 and the smallest big number to use is 7. I then ran out of number trying to get 21, 13 and 15 sums.
The sum is the result of an addition.
When you add two numbers, the result you find is the sum of the two numbers.
15+10=25. The sum of 15 and 10 is 25.
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