Hey guys I'm back with a second probability question:

https://www.mathsgenie.co.uk/alevel/s1jan2011ans.pdf

I'm stuck on question 7a, I don't understand how they figured out the probability for each direction. Is the second section of branches supposed to be Bag Q? Or is it the third section? Genuinely just don't understand the whole diagram and how they got the numbers.

https://www.mathsgenie.co.uk/alevel/s1jan2011ans.pdf

I'm stuck on question 7a, I don't understand how they figured out the probability for each direction. Is the second section of branches supposed to be Bag Q? Or is it the third section? Genuinely just don't understand the whole diagram and how they got the numbers.

Original post by cherrycosmos

Hey guys I'm back with a second probability question:

https://www.mathsgenie.co.uk/alevel/s1jan2011ans.pdf

I'm stuck on question 7a, I don't understand how they figured out the probability for each direction. Is the second section of branches supposed to be Bag Q? Or is it the third section? Genuinely just don't understand the whole diagram and how they got the numbers.

https://www.mathsgenie.co.uk/alevel/s1jan2011ans.pdf

I'm stuck on question 7a, I don't understand how they figured out the probability for each direction. Is the second section of branches supposed to be Bag Q? Or is it the third section? Genuinely just don't understand the whole diagram and how they got the numbers.

p(red from P) = 3/6 = 1/2

Second level

p(red from P | you drew a red from P and placed in Q) = 2/5

Third level

p(red from Q | you drew 2 reds from P and placed in Q) = 6/9

(edited 1 month ago)

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