CAT Reasoning > Clocks PYQs

In a tournament, there are $43$ junior level and $51$ senior level participants. Each pair of juniors play one match. Each pair of seniors play one match. There is no junior versus senior match. The number of girl versus girl matches in junior level is $153$, while the number of boy versus boy matches in senior level is $276$. The number of matches a boy plays against a girl is

The numbers $1, 2,..., 9$ are arranged in a $3 \times 3$ square grid in such a way that each number occurs once and the entries along each column, each row, and each of the two diagonals add up to the same value. $$\newline$$ If the top left and the top right entries of the grid are $6$ and $2$, respectively, then the bottom middle entry is