Question 45
In a school there are $m$ boys and $j$ girls, $m \geq 1, 1 \leq j \lt 2004$.
Every student has sent a post card to every student. It is known that the number of the post cards sent by the boys is equal to the number of the post cards sent by girl to girl. Find all possible values of $j$.
Every student has sent a post card to every student. It is known that the number of the post cards sent by the boys is equal to the number of the post cards sent by girl to girl. Find all possible values of $j$.