MathParadise

http://www.boston.com/bostonglobe/ideas/articles/2009/02/08/a_talk_with_mario_livio/?page=2

1) What is the limit of xe^(-x) as x approaches infinity?

2)What is the limit of (x^2) e^(-x) as x approaches infinity?

3) Is there a value of n where the limit of (x^n)e^(-x) as x approaches infinity is not zero?

How can you get 1110 using seven 9s?

http://komplexify.com/blog/2006/03/09/on-the-proof-of-the-supposed-evilness-of-girls/

1. My first is twice in apple but not once in tart. My second is in liver but not in heart. My third is in giant and also in ghost. Whole I’m best when I am roast. What am I?

2. There are five acquaintances. One of them shot and killed one of the other five. Which man is the murderer? 1. Dan ran in the NY City marathon yesterday with one of the innocent men. 2. Mike considered being a farmer before he moved to the city. 3. Jeff is a top-notch computer consultant and wants to install Ben?s new computer next week. 4. The murderer had his leg amputated last month. 5. Ben met Jack for the first time six months ago. 6. Jack has been in seclusion since the crime. 7. Dan used to drink heavily. 8. Ben and Jeff built their last computers together. 9. The murderer is Jack’s brother; they grew up together in Seattle.

3.  Waiter asks “How many?”

Each person comes up with a different number.
1….3….4…and 0.
All of them are right.
how is this true?

4.  Sam Sham, Captain Frank, and a few other men were swapping war stories. Sham told one about his uncle Sly who lost his arm during the war. “Uncle Sly met a General who was shocked that Sly had lost his arm and yet had not received a medal for bravery. The general removed one of his own medals and pinned it on Sly’s uniform. He then mentioned that had Sly lost both arms, he would have received a commission. Hearing this, Sly withdrew his sword and with one swift stroke, he cut off his other arm. Shortly thereafter, he was appointed Minister of Armaments.” Captain Frank looked blankly at sham and said, “You couldn’t possibly expect anyone to believe that yarn, could you?” Why not?

5. A man goes into a bank one day and deposits $1,663.
A few days later he enters the same bank and deposits $1,527.
A few more days and the man deposits $1,126 and then $1,096.
How much will the man deposit next time he enters the bank??

Here are the numbers for you again:
1663
1527
1126
1096

6. What is small, round and wears shorts?

7. An old man did not have much except a well near his house.
He had two sons. he loved the elder more.
so while dying he gave his house to the elder and well to the younger
but there was a condition the water in the well belonged to the elder.
The elder son was wicked. He drove the younger out of his house.
So the younger made a small hut close by. But the elder charged him for the water from the well because he owned the water.
After a year the younger one went to the King to ask for justice. The King heard the case, and passed a judgment that pleased the younger and the elder was left at loss. What was the King’s judgment?

1. What is a Fedja?

2. There are three chickens and one bird on the seashore and across the ocean there are 7 dogs. Two boats can bring them across but they can only go 3 at a time. Chickens can’t go with birds because they will fight. Dogs cant go with chickens because they will eat them. How do they get across?

3. A guy gets on a plane, sits down and notices his friend. He greets his friends and then gets thrown off the plane and put in jail. Why?

4. What can you hold in your left hand but not in your right hand?

5. There are seven girls on a school bus. Each girl has seven backpacks. in each backpack there are seven small cats. For every small cat, there are 8 big cats. how many legs are on the bus?

6. I saw a man in white, he looked quite a sight. He was not old, but he stood in the cold. And when he felt the sun, he started to run.

A fisherman rowing his boat on a very small lake throws his anchor into the water. Does the water level of the lake rise, fall, or stay the same?

What was the name of the Square Root Dog. And why was it called the Square Root dog?

An infinite number of mathematicians walk into a bar. The first one orders a beer. The second orders half a beer. The third, a quarter of a beer. The bartender says “You’re all idiots”, and ”
pours two beers.

This is a worthy read if you have ever tried calculating all the digits of pi:

http://www.everything2.net/index.pl?node_id=1302963