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Post by Marshal Ney on Jan 2, 2018 10:49:31 GMT
Suppose there are three cards:
•A black card that is black on both sides
•A white card that is white on both sides
•A mixed card that is black on one side and white on the other.
All the cards are placed into a hat and one is pulled at random and placed on a table. The side facing up is black. What are the odds that the other side is also black?
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Post by Wilhelm Ritter von Leeb on Jan 2, 2018 10:51:40 GMT
Suppose there are three cards: •A black card that is black on both sides •A white card that is white on both sides •A mixed card that is black on one side and white on the other. All the cards are placed into a hat and one is pulled at random and placed on a table. The side facing up is black. What are the odds that the other side is also black? 33,3% Note: I thought that 50% was too simple to be the answer, but I suppose I was wrong. Also, Marshal Ney's riddles are weird, so the answer might be none of these. |
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Post by liamcog on Jan 2, 2018 12:17:34 GMT
I got 50%
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Post by Nobunaga Oda on Jan 2, 2018 12:37:07 GMT
I counted 40%
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Post by Wilhelm Ritter von Leeb on Jan 2, 2018 12:46:16 GMT
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Post by Nobunaga Oda on Jan 2, 2018 16:36:09 GMT
By accidentally counting all possibilities. |
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Post by Marshal Ney on Jan 2, 2018 17:12:23 GMT
Wilhelm Ritter von Leeb , liamcog , Nobunaga Oda Solution: 66.6% There are 6 faces, of which 3 faces are white and 3 faces are black. 2 of the 3 black faces belong to the same card. The chance of choosing one of those 2 faces is 2/3. Therefore, the chance of flipping the card over and finding another black face is also 2/3
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Post by Hugh III of Burgundy on Jan 2, 2018 17:27:59 GMT
100% guys
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Post by Desophaeus on Jan 2, 2018 17:39:26 GMT
Wilhelm Ritter von Leeb , liamcog , Nobunaga Oda Solution: 66.6% There are 6 faces, of which 3 faces are white and 3 faces are black. 2 of the 3 black faces belong to the same card. The chance of choosing one of those 2 faces is 2/3. Therefore, the chance of flipping the card over and finding another black face is also 2/3 Incorrect premise 4 faces to start with, not 6, actually. The card with the two white faces is ALREADY excluded from the calculations seeing as it can not be the card that you drew from the hat. Now, 2 of those faces would be already determined since you have a card with a black face up. Leaving only 2 faces to imbue the odds on. So the only remaining question is whether if it's also black on the other side or not. Logical deduction of selecting from a pool of faces relies on what is available and what is not available. |
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Post by Wilhelm Ritter von Leeb on Jan 2, 2018 23:19:46 GMT
There seems to be an issue with the proboards servers again.
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Post by liamcog on Jan 2, 2018 23:30:44 GMT
There seems to be an issue with the proboards servers again. How so? |
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Post by Wilhelm Ritter von Leeb on Jan 2, 2018 23:34:55 GMT
There seems to be an issue with the proboards servers again. How so? The "server issues" message appeared several times on me. Proboards uses different servers for different regions though, so it might not apply to everyone. |
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Post by Leonid Govorov on Jan 3, 2018 1:20:13 GMT
The "server issues" message appeared several times on me. Proboards uses different servers for different regions though, so it might not apply to everyone. Korea's fine... Maybe just Greece? |
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Post by Hobo Joe on Jan 3, 2018 1:59:28 GMT
Im getting errors all over the place as well
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Post by Leonid Govorov on Jan 3, 2018 2:15:16 GMT
Mountbatten, when can we start submitting names for RA13?
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