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= 36
A = (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)
N(A) = 15
P(A) = N(A)/N(S)
= 15/36
b. A = (1,2)(1,3)(2,1)(2,2)(3,1)
N(a) = 5
P(a) = n(a) /n (s)
= 5/36