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# S1 - Proability question watch

1. For the second to last part I got

2/5 I did

6/10 * 3/9 * 6/8 + 4/10 * 6/9 * 3/8
2. (Original post by IShouldBeRevising_)

For the second to last part I got

2/5 I did

6/10 * 3/9 * 6/8 + 4/10 * 6/9 * 3/8
Which part

If you mean (i)c I get something different
3. (Original post by TenOfThem)
Which part

If you mean (i)c I get something different
yh ic
4. (Original post by TenOfThem)
Which part

If you mean (i)c I get something different
I don't get why my method is wrong?
5. (Original post by IShouldBeRevising_)
I don't get why my method is wrong?
I have no idea what that method is but there is no division by 0.4 so it cannot be correct
6. Have you tried drawing a probability tree?

If you did that, I'm sure you'd find all the different routes for the sequences that you are asked about. In general, I believe that your method is getting there but perhaps you are using the wrong numbers - a tree might help you to spot your own error with both numbers and number of routes.

7. (Original post by Leen!)
2/15
You are not suggesting that is the answer are you?
8. (Original post by TenOfThem)
You are not suggesting that is the answer are you?
Have I got it wrong?
9. (Original post by Leen!)
Have I got it wrong?
That is the probability that the first and third are both blue
10. (Original post by Leen!)
And what have you found, then?
The probability that the 3rd was blue given that the 1st was blue
11. (Original post by TenOfThem)
The probability that the 3rd was blue given that the 1st was blue
Haha, you're funny...
12. (Original post by Leen!)
Haha, you're funny...
In what way?
13. (Original post by Leen!)
Haha, you're funny...
You do realize that P(A given B) and P(A and B) are different concepts in probability, don't you??
14. (Original post by davros)
You do realize that P(A given B) and P(A and B) are different concepts in probability, don't you??
You and me ... comedy double act?
15. (Original post by davros)
You do realize that P(A given B) and P(A and B) are different concepts in probability, don't you??
Oh yeah! I see.
16. (Original post by TenOfThem)
In what way?
Irony.
17. (Original post by TenOfThem)
You and me ... comedy double act?
I say, I say, I say...

(Original post by Leen!)
Irony.
Is that a type of metal, like goldy or bronzy?
18. (Original post by TenOfThem)
You and me ... comedy double act?
(Original post by davros)
...
Interestingly, the surname fo the female star of "Ten" and Davros's creations, both start and end with the same letters.

Spooky!
19. (Original post by davros)
Is that a type of metal, like goldy or bronzy?

...
20. (Original post by ghostwalker)
Interestingly, the surname fo the female star of "Ten" and Davros's creations, both start and end with the same letters.

Spooky!
There's a blue bottle in my bathroom with the same start and end letters as my name that is responsible for killing millions of germs. And my creations have killed millions throughout the galaxy!

That's spooky

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