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# Probability help!! watch

1. Ok im in a fix (yes its my fault), but i need to get over that. Any who , has anyone happen to have a good video covering and and/or rules on probability for edexcel higher ? Thanks in advance
2. (Original post by techcloud14)
Ok im in a fix (yes its my fault), but i need to get over that. Any who , has anyone happen to have a good video covering and and/or rules on probability for edexcel higher ? Thanks in advance
3. What bit of probability are you struggling with? Usually just tree diagrams come up in the exams. We've done loads of edexcel higher past papers at school and that is what comes up. So is that what you are struggling with?
4. And = times the probabilities together e.g. 1/3 x 3/5 = 3/15
Or = add the probabilities together e.g. 1/3 + 3/5 = 5/15 + 9/15 = 14/15
5. (Original post by Albus Hagrid)
And = times the probabilities together e.g. 1/3 x 3/5 = 3/15
Or = add the probabilities together e.g. 1/3 + 3/5 = 5/15 + 9/15 = 14/15
You do realize this is very dangerous advice?

You can only multiply probabilities like that if the events are independent, and you can only add probabilities like that if the events are mutually exclusive, otherwise you have to take account of the the fact that you might be double counting if they occur together!
6. tree diagrams help me answer most probability questions for AQA S1

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