# Set Notation:

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 :)

$$A\cup B$$ 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?

$$A\cap B is the event "both A and B" Does this mean that both events MUST happen?$$

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HallsofIvy
Homework Helper
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 :)

$$A\cupB$$ 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?
Yes, that is the "inclusive" or: A or B or both.

$$A\capB is the event "both A and B" Does this mean that both events MUST happen?$$
Yes.

Now I'm getting a message that my reply is too short! How long does it have to be?

Gib Z
Homework Helper
10 characters :p