Geometry please help me need to finish!

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1.Who was Blaise Pascal and how did he help start the study of probability?
2.Who was Pierre de Fermat and how did he help start the study of probability?
3.What was the relationship between Blaise Pascal and Pierre de Fermat and what were they studying when they began writing about probability ?
4.What is the probability that a certain event is going to happen?What is the probability that a certain event is going to happen?

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