I am given a joint probability density function for X, Y, defined as f(x,y)=1, for 0≤x≤1,0≤y≤1, and 0 elsewhere. I need to find P(X−Y≤12).....how to solve using geometric approach ? how to solve using calculus approach? please elaborate your solution so that it is easy to understand.
also,can anyone post which books to refer for advanced probability and calculus at first year of bachelors level
p.s. i just passed my 12th and will start college soon.