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If the occurrence of some events are dependent on the occurrence of an event A then sum of all the joint

probabilities in which the occurrence of event A is considered gives the

a) Subjective probability of event A

b) Classical probability of event A

c) Conditional probability of event A

d) Marginal Probability of event A

e) Relative frequency of occurrence of event A

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d) Marginal Probability of event A

Let us say i have two boxes A and B and both have red balls. Now i want to find the probability of Red ball.Now ball can come from box A and box B.These are mutual exclusive events as ball will come from A or B and collectively exhaustive events.So Bayee's theorem will be applicable here,by which we can say that Probability of Event Red ball(Er) is the sum of joint probabilities of selecting a box and getting Red ball.

Now getting Red ball is the Event A as per your question. And occurrence of Some events from question means  Selecting box 1 and 2,which is depending on the Event of selecting ball Red.So we get here the marginal probability of A

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