**The first one is how to cheer up your friend…**

**Just don’t tell him he should have one ovary**

**This actually appeared in a textbook…**

Posted by mathfail
on March 31, 2010
No comments

Posted by mathfail
on March 31, 2010
No comments

**Cool fact**: If you thoroughly shuffle an ordinary deck of 52 playing cards, chances are that the resulting arrangement of cards has never existed before (via Reddit and Reddit).

Quoting from the math subreddit:

“Proof — easy numeric comparison. There are 52! possible orderings of a deck, and I’m assuming all are equally likely after your shuffling. Let’s wildly overestimate and assume that every second since the universe was created, a million decks of cards were shuffled and someone looked through them. Thus fewer than 10^24 orderings have ever been seen.

But at an incredibly crude estimate, 52! is at least 10^42 * 10!; let’s underestimate that again wildly by 10^42. That means that chances of your ordering ever having come up previously are at most 1 in 10^18.

(Note, by the birthday paradox, the chances that there have been two identical orderings observed by two people in history are quite a bit higher — perhaps even feasibly likely; I haven’t calculated it. But we’re looking here at the probability that a given ordering matches one of the ones previously seen.)“

Discussion here.

Posted by mathfail
on March 29, 2010
No comments

This is pretty funny (via the consumerist).

Comcast sent a letter to this guy named Aaron demanding he pays -$0.05 to avoid interruption in service.

Posted by mathfail
on March 29, 2010
1 comment

This is old but curious nevertheless:

The y-axis is % of majors that are virgins

The x-axis is of course the student’s major.

Seems that Wellesley College is an all-girls college? Some insight into the origins of the graph.

Posted by mathfail
on March 28, 2010
No comments

As stated on the WolframAlpha blog, new features have been implemented:

“You can ask directly for the probability of a full house or other common hands, as well as the probabilities of various outcomes when you play Powerball, roll two 12-sided dice, or repeat any sequence of trials with a 20% chance 4 times.

… Other additions have brought everything from Archimedes’ axiom to semiaxes and square pyramid syntax into our body of computable knowledge and functions.“

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