Question 6
Place the numbers in $P=\{1,2,3,4,5,6,7,8,9\}$ into the nine cells of the shown $3\times3$ grid, using each number once. The sum in each row, each column and each of the two diagonals must be divisible by 9. The centre entry is $T$.
(a) Find every possible value of $T$.
(b) For each value, give an example of a completed grid.
(a) Find every possible value of $T$.
(b) For each value, give an example of a completed grid.