p४०bability inhabitant...mm
Integers a,b,c and d not necessarily distinct ,are chosen independently and at random from the set S = {0,1,2,3,4.....2006,2007} . If the probablity that |ad-bc| is even ,is p/q where p and q are relatively prime then evaluate tha value of (p+q) .
The answer is 13.
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