You are Here: Home >< Maths

# probability question watch

1. what is the probability of a given b if a and b are indeoenant events? surely this equals p (a N b) divided by p (b), butnthey are independent so won't effect each other?
2. (Original post by jonjoshelvey21)
what is the probability of a given b if a and b are indeoenant events? surely this equals p (a N b) divided by p (b), butnthey are independent so won't effect each other?
Independent means that - quite self explanatory, because B happening does not influence whether A will happen any way whatsoever. So the probability that A happens if B happens, is the same as just if A happens.

Alternatively, we can say where the second equality is true because if A,B are independent.
3. (Original post by RDKGames)
Independent means that - quite self explanatory, because B happening does not influence whether A will happen any way whatsoever. So the probability that A happens if B happens, is the same as just if A happens.

Alternatively, we can say where the second equality is true because if A,B are independent.
thanks. what's the formula for the probability of a or b happening if they are independent events
4. (Original post by jonjoshelvey21)
thanks. what's the formula for the probability of a or b happening if they are independent events
That would be

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: March 4, 2018
Today on TSR

### University open days

• Southampton Solent University
Sun, 18 Nov '18
Wed, 21 Nov '18
• Buckinghamshire New University
Wed, 21 Nov '18
Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams