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# Is there a way to show that if an event will always occur its independent of any othe watch

1. r event?
2. (Original post by Trackstar)
r event?
Well, how can you express the fact that an event will always occur as a mathematical statement?

What formula do you know from probability that tells you when 2 events are independent?
3. (Original post by davros)
Well, how can you express the fact that an event will always occur as a mathematical statement?

What formula do you know from probability that tells you when 2 events are independent?
P(anb)=P(a)P(b)
4. (Original post by Trackstar)
P(anb)=P(a)P(b)
OK, that's what you want to prove.

Do you know another formula for P(a n b) involving conditional probability (one that doesn't assume independence)?

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