Original post by ARiazz
Carry on the tree diagram, but do it as if there are 5 cards to choose from the second time, not 6 as you've already picked one.
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Original post by z_o_e
Ok, so you started off with AAABBC as the 6 cards, you got the first bit right.
For the second part, you have to calculate the probabilities after each card has been picked.
So when A was picked as one card, the second card could be out of AABBC (one of the As are gone). So the second probability for A is 2/5, not 1/5.
When B is picked first, you're left with AAABC, and when C is picked first, you're left with AAABB.
Original post by ARiazz
Ok, so you started off with AAABBC as the 6 cards, you got the first bit right.
For the second part, you have to calculate the probabilities after each card has been picked.
So when A was picked as one card, the second card could be out of AABBC (one of the As are gone). So the second probability for A is 2/5, not 1/5.
When B is picked first, you're left with AAABC, and when C is picked first, you're left with AAABB.
For the second part, you have to calculate the probabilities after each card has been picked.
So when A was picked as one card, the second card could be out of AABBC (one of the As are gone). So the second probability for A is 2/5, not 1/5.
When B is picked first, you're left with AAABC, and when C is picked first, you're left with AAABB.
That's what I wrote didn't I?
Posted from TSR Mobile
Original post by z_o_e
after choosing A, you're left with AABBC for the second choice. So you got the 2/5 bit for A right. However, the probability of picking B will be 2/5 and C 1/5 after picking A. I'm sure you can do the rest now.
Original post by ARiazz
after choosing A, you're left with AABBC for the second choice. So you got the 2/5 bit for A right. However, the probability of picking B will be 2/5 and C 1/5 after picking A. I'm sure you can do the rest now.
oooooh. This is what I did
Posted from TSR Mobile
Original post by z_o_e
Yeah, that's right.
All is left is to calculate the total probability when 2 different cards are picked. Multiply along the branches of the diagram and add up the probabilities across.
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