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Let A = { 1,3,5,7,9 } and B= { 2,4,6,8 }...

Let `A = { 1,3,5,7,9 } and B= { 2,4,6,8 }`. An element `(a,b)` of their cartesian product `Axx B` is chosen at random. The probability that `a + b = 9` is

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