Friends this is a problem i had posted two weeks ago maybe . Did anyone find a pragmatic solution. This question is from the AITS which fiitjee conducts unfortunately i don't have the hints and solutions.I only know the answer.Do participate in this discussion. and try to help me out.
A matrix is used to keep track of three football players (numbered 1,2 and 3) in three matches (1st,2nd and 3rd).
A= number of matches in which both jth and kth players played or both did not play.
B = (number of matcher played by kth player) - (number of matches played by jth player)
Let C=1 if jth player played in kth match and C=i otherwise
Only in the answer two parallel lines represent det and not absolute value.
The answer is D is a non negative multiple of four. but how???????