CGPET 2011 Solved Paper

Two squares can be chosen in a single row by 7 ways as there are 8 squares in each row. But there are 8 rows. So, number of ways to choose two squares in any of the row =7×8=56. Similarly, number of ways to choose two squares in any of the column =56
∴‌ Total number of favourable cases ‌‌=56+56
‌=112 and total number of cases =‌64C2=‌

64×63

2

=32×63
∴ Required probability =‌

112

32×63

=‌

1

18