Chessboard filled with numbers, having same sum always if exactly $1$ number is taken from each row and each column
54871
Sum of numbers on chessboard.
47012
When a 0-1-matrix with exactly two 1’s on each column and on each row is non-degenerated? [1]
151672
Summing values if same second column value
65154
Code for checking the same data present in table column
157280
How do I sum up specific things in Numbers?
61417
List of numbers giving a particular sum
139237
How to sum over duplicates?
84865
A 5x5 board has 25 cells.The numbers $\{1,2,3,4,5\}$ are written on every row,every column and the two main diagonals.
29713
$k$ times's draw from $n$ numbers with replacement, each number at least appear once
158124
Sum of all the positive integers problem
91112
Rooks on a 8 by 8 checker board. Probability problem
114863
Representing a given number as the sum of two squares.
11359
Determine the Set of a Sum of Numbers
151508
How to determine number with same amount of odd and even divisors
52564
$m\times n$ matrix with an even number of 1s in each row and column
117407
How to calculate the sum of the data that have the same ID in the first column?
87505
binomial coefficient equal to sum