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=‌