LogFAQs > #905501165

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Topic	IQ Test
2SweetforTurtle 07/21/18 11:25:31 PM #72:	CrestedTax posted... 2SweetforTurtle posted... 2/3 makes no sense. It says you picked from the same box, and already have a gold from the first pick. Therefore it CANNOT be the third box. It does make sense. There are a total of 3 gold balls. If you take 1 golden ball from a random box, the odds that you took it from the box with 2 gold balls is 2/3, while the odds of taking it from the one with just 1 gold ball is 1/3. Thus, once you take 1 golden ball you know that there is a 2/3 chance that it's from the box with 2 golds. Youre ignoring the fact that it states youre choosing from the SAME box. The total number of gold balls is irrelevant. Once you choose a box, theres a 50 percent chance that youll get a gold ball (three gold and three silver balls). Picking a gold ball out of the box that you chose eliminates the box that has zero gold balls from the equation. --- Slow and steady wins the race <cite>2SweetforTurtle posted [p:905501165] in IQ Test... [t:76827804]...</cite> <quote><cite>CrestedTax posted...</cite> <quote><cite>2SweetforTurtle posted...</cite> <quote>2/3 makes no sense. It says you picked from the same box, and already have a gold from the first pick. Therefore it CANNOT be the third box.</quote> It does make sense. There are a total of 3 gold balls. If you take 1 golden ball from a random box, the odds that you took it from the box with 2 gold balls is 2/3, while the odds of taking it from the one with just 1 gold ball is 1/3. Thus, once you take 1 golden ball you know that there is a 2/3 chance that it's from the box with 2 golds.</quote> Youre ignoring the fact that it states youre choosing from the SAME box. The total number of gold balls is irrelevant. Once you choose a box, theres a 50 percent chance that youll get a gold ball (three gold and three silver balls). Picking a gold ball out of the box that you chose eliminates the box that has zero gold balls from the equation. --- Slow and steady wins the race</quote> ... Copied to Clipboard!
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