Hi

       X      Y      Tot



A    24     31      55



B    13     66      79



Tot  37     97     134

.......

P(A or B) = P(A) + P(B) - P(A and B)

 P(X or A) = 37/134 + 55/134 - 24/134 = 68/134 = 34/67

.......

P(A|B) = P(A and B)/P(B)

P(X|A) =  = 24/55

Good  Work. 

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