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A box contains six cards. Three of the cards are black on both sides, one card is black on one side and red on the other, and two of the cards are red on both sides. You pick a card uniformly at random from the box and look at a random side. Given that the side you see is red, what is the probability that the other side is red? Express your answer as a common fraction.

Guest Nov 1, 2018
 #1
avatar+13567 
+1

There are three possibilities   1  possible black on the other side   2 possible red on the other side

given you drew a red, I think you have a  2/3 chance the other side is red too.

ElectricPavlov  Nov 1, 2018
 #2
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+1

That is incorrect.

Guest Nov 1, 2018
 #3
avatar+93866 
+1

You have picked up a 

BR, or RR or RR card

You can see one red side the other side could be

B,R,R,R,R

 

So I think the probability that the other side is red is     4/5

Melody  Nov 1, 2018
 #4
avatar+13567 
+1

SO it is like you have 6 cards      One black and 5 red

you draw a red, then what is the chance of the next draw is red.....?

   there are 5 cards left    4 are red and one is black

       4/5           is that how to view this ?

ElectricPavlov  Nov 1, 2018
 #5
avatar+93866 
0

I think so EP but I would have liked the question asker to come back and confirm my answer, one way or the other.

I think it is right though. :/

Melody  Nov 2, 2018

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