The 3rd point is extremely vague. Diagonally opposite could mean 1/3 is diagonally opp 6/4 resp(which it means in the context of this set) or it could mean 5/2 is diagonally opp 1 and 3/4 and 6 resp. This should have been mentioned in some way to make it clearer. Even though it affects only one question, clarity would be better.
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think of 3*2 matrix (a diagonal is a line joining the vertices of a figure, now assume the four extreme points of brackets used to define a matrix as vertices and join them, you will get only 6-4 and 1-3 as diagonals).
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This is how it is done i=usualyy in every question, it is the standard