number of ways of selecting pair of black squares in chessboard such that they have exactly one common corner is equal to ______________

 

Asked by samyakagarwal7may | 12th Oct, 2018, 11:45: PM

Expert Answer:

 
There are 3 types of black squares
1. corners - 2
2. side - 12
3. middle - 18
corner box has 1 option
side box has 2 options
middlebox has 4 options
number of ways
2x1+12x2+18x4  

Answered by Arun | 13th Oct, 2018, 06:15: PM