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CBSE Class 11-science Answered

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 | 12 Oct, 2018, 11:45: PM
answered-by-expert 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 | 13 Oct, 2018, 06:15: PM
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