Question 1206166
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You are not going to get useful responses to your posts if you don't present the problems clearly....<br>
The meaning of "Let events  and  be defined..." is unclear; possibly you used some symbols that did not survive the trip to this site.<br>
The 7 given probabilities add to 1, so we can guess that the outcomes are mutually exclusive.<br>
Beyond that, we really have to guess what is going on.<br>
Given "A=1,5,6" and "B=4,7", we can guess that "P(AUB)" is P(1)+P(5)+P(6)+P(4)+P(7)....<br>
But the meaning of "A/B=2,3" is a complete mystery.<br>
Re-post your problem clearly if you want help with it....<br>