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Mesmer

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I'm having a little difficulty understaning the notation used in my probability class. Would someone tell me if I'm on the right track with it :)

[tex] A\cup B [/tex] is the event "either A or B or both."

[tex] A\cap B is the event "both A and B" Does this mean that both events MUST happen? [/tex]

[tex] A\cup B [/tex] is the event "either A or B or both."

**Does this mean that A and B can happen together and that A or B can happen alone?**[tex] A\cap B is the event "both A and B" Does this mean that both events MUST happen? [/tex]

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