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a)
A={(1,1)(1,3)(1,5)(3,1)(3,3)(3,5)(5,1)(5,3)(5,5)}
|A|=9
P(A)=9/36=1/4
b)
B={(1,1)(1,2)(1,3)(1,4)(1,5)(2,1)(2,2)(2,3)(2,4)(3,1)(3,2)(3,3)(4,1)(4,2)(5,1)}
|B|=15
P(B)=15/36=5/12