Think logically not mathematically [part-14]
The sum of all the squares of numbers in a normal solved sudoku is _ _ _ _
The answer is 405.
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1 solution
When we consider a row the there are numbers from 1 to 9 so their sum is 45 and also there are 9 such rows so the sum of all numbers in a 9 × 9 sudoku is 4 5 × 9 = 4 0 5