what have you thought of so far :/
Original post by Qxi.xli
what have you thought of so far :/
Im so stuck i havent got anything yet
Original post by as551
Im so stuck i havent got anything yet
I'm not entirely sure either tbh lmao but I think it's solvable once you draw a tree diagram. Maybe try that?
Original post by Qxi.xli
I'm not entirely sure either tbh lmao but I think it's solvable once you draw a tree diagram. Maybe try that?
I tried that but im still really stuck!
Original post by as551
I tried that but im still really stuck!
Can you post a pic of it?
After you draw one I think it should be fairly easy to solve? You just add the probabilities of when the first disc has a smaller probability than the second I think.
Original post by GoodLuckFor2021
....
you're not allowed to give answers on this forum lol
(edited 3 years ago)
Original post by as551
These 20 discs are in bag
11, 11, 11, 11
22, 22, 22, 22, 22, 22
33, 33, 33, 33, 33, 33, 33
44, 44, 44
Two of the discs are taken at random from the bag
Work out the probability that the first disc has a smaller number than the second disc
11, 11, 11, 11
22, 22, 22, 22, 22, 22
33, 33, 33, 33, 33, 33, 33
44, 44, 44
Two of the discs are taken at random from the bag
Work out the probability that the first disc has a smaller number than the second disc
Did you get a answer for this one. I am struggling aswell.
I got 239/380 if that helps, idk if it’s right though
Original post by Slippysausage123
I got 239/380 if that helps, idk if it’s right though
Acc I tried it again and got 29/76
Original post by Slippysausage123
Acc I tried it again and got 29/76
Could you explain your method?
Original post by grace1x
i think I have the answer! i believe its
(38.1/4 X 16/19) + (6/20 X 10/19) + (7/20 X 3/19) which gives you 29/76 and 29/76 as a % is 38.1%
(38.1/4 X 16/19) + (6/20 X 10/19) + (7/20 X 3/19) which gives you 29/76 and 29/76 as a % is 38.1%
Original post by kavsd
Hey, sorry, but I was just wondering where you got the 38.1 from at the beginning? Thanks
To understand this, draw a tree diagram.
Also, carefully read the question, picking the first disk, followed by the second disk, (without replacing them is implied by the wording).
(This question will be relatively harder if this information, i,e. picking the first disk, followed by the second disk, is not given.)
In your tree diagram, the disk on first the branch must be less than the disk on the second branch, so mark all those branches, (and you must know what to do with those branches).
I leave it to you to figure out altogether how many branches the tree diagram will have.
(Since these are mutually exclusive events, all branches of your tree must add to 1 or, 100%).
Also, carefully read the question, picking the first disk, followed by the second disk, (without replacing them is implied by the wording).
(This question will be relatively harder if this information, i,e. picking the first disk, followed by the second disk, is not given.)
In your tree diagram, the disk on first the branch must be less than the disk on the second branch, so mark all those branches, (and you must know what to do with those branches).
I leave it to you to figure out altogether how many branches the tree diagram will have.
(Since these are mutually exclusive events, all branches of your tree must add to 1 or, 100%).
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