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anesh krishna Grade:
        

two squares are chosen at random on a chess board findthe probability that they have common side?


 


ans:i got the ans as 38/3451..........is this correct ? if not how to do?


 

7 years ago

Answers : (1)

Rathod Shankar AskiitiansExpert-IITB
69 Points
										

 


Dear anesh krishna,


 64 no of squares and we can choose first square by 64 ways


and second by 63ways.


There are a total of 64 * 63 = 4032




corners have only 2 adjacent squares. we have 4 corners.


total we can choose using corner square are=4*2


another 24 squares along the boundaries they have 3 adjacent squares.


total no= 24*3


the remaing squares are 34 they have 4 adjacent sides.


total= 36*4


number of combinations = (4 * 2) + (24 * 3) + (36 * 4) = 224


 = .


 


 


 


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Askiitians Expert


Rathod Shankar Singh


IIT Bombay


 

7 years ago
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