Tuesday, May 15, 2007


As promised, here is the first problem of the day. This one was brought to me by Kyle, my sister's friend's brother whom I met at my sister's graduation last week:

Take 12 pennies, arranged in a rectangle of 4 rows and 3 columns. Next, randomly remove 4 of those pennies. What is the expected number of complete rows that remain?

I will post the answer to this puzzle later tonight. I may ROT13 it so that I don't spoil it for any readers.

(PS -- LHIRT is the acronym of my pseudonym)

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