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antoni7
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In a bag there are 2 black and 4 white identical rings. Two rings are drawn from the bag at random. Find the probability that only one of them is white.
 one year ago
 one year ago
antoni7 Group Title
In a bag there are 2 black and 4 white identical rings. Two rings are drawn from the bag at random. Find the probability that only one of them is white.
 one year ago
 one year ago

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satellite73 Group TitleBest ResponseYou've already chosen the best response.2
first one is black AND second one is white OR first one is white AND second one is black is one way to proceed
 one year ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.2
\[\frac{2}{6}\times \frac{4}{5}+\frac{4}{6}\times \frac{1}{5}\] is one way there are others
 one year ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.2
for example you could compute \[\frac{\binom{4}{1}\times \binom{2}{1}}{\binom{6}{2}}\]
 one year ago

satellite73 Group TitleBest ResponseYou've already chosen the best response.2
second way is probably snappier, gives \[\frac{8}{15}\] right away
 one year ago

klimenkov Group TitleBest ResponseYou've already chosen the best response.0
@satellite73 May be there is a mistake in your second post? Can you please explain why does the second way give the right result?
 one year ago

antoni7 Group TitleBest ResponseYou've already chosen the best response.0
thank you :)
 one year ago
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