Riddle: I'm a seed that's underground. Many like to spread me around. But my family it's said is quite insane. And if you've a low I.Q. you've this kind of brain. Eat me raw and I'll make you sick. Eat too much and your tongue will stick.
What am I?
Answer: A peanut.
Spread me around Riddle Meme with riddle and answer link.
Riddle: A triangle has sides of 13, 18 and 31 inches. What is the triangle's area?
Answer: Zero. The two shorter sides of a triangle, when added together (13+18=31), must be greater than the third or longest side (31) for it to be a triangle by definition. Therefore, the result would be two parallel lines with an area of 0.
A triangle has sides of 13 18 and 31 inches Riddle Meme with riddle and answer link.
Riddle: My dress is tranquil when I tread the earth, or dwell at home, or drift on the water. Sometimes my wings and this wide sky lift me over the dwellings of men, and then strong clouds carry me over the people. My ornaments echo loudly and melodiously, Illustriously sing when I am not near the earth and stream, a sailing spirit.
What am I?
Answer: A swan.
Sailing Spirit Riddle Meme with riddle and answer link.
Riddle: You have 52 playing cards, 26 red, and 26 black. You draw cards one by one. A red card pays you a dollar. A black one fines you a dollar. You can stop any time you want. Cards are not returned to the deck after being drawn. What is the optimal stopping rule in terms of maximizing your expected payoff? Also, what is the expected payoff following this optimal rule?
Answer: The solution to this problem is, in my opinion the most difficult to understand of all the puzzles. Indeed I was unable to solve it and didn't receive a complete solution until two years after originally posting it. The final solution, in the form of the spreadsheet was sent to me by Han Zheng. For this reason I have left on the page the thoughts i had before I had the final solution as they represent an easier to understand and more simplistic approach. Also the reasoning may help you arrive at the final solution by yourself or help you understand it. I would recommend reading that answer before you dive into the full answer. But an important thing to note are that as the player we can't lose this game as we can gamble till all the cards are drawn and our net position is zero. From our earlier analysis it is clear we need a dynamic quit rule. A singal value is not sufficent. We must, at each stage consider what cards are remaining, and therefor the probability of a positive or negative outcome from drawing again. For the explanation i will ask you first to consider a deck containing only 6 cards, 3 +ve & 3 -ve (note i'm no longer calling the cards black and red, it confuses me.)
The Card Riddle Riddle Meme with riddle and answer link.
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