> After twelve days of Christmas, I will have recieved 12 drummers drumming, 22 pipers piping, 30 lords a-leaping, 36 ladies dancing, 40 maids a-milking, 42 swans a-swimming, 42 geese a-laying, 40 golden rings, 36 calling birds, 30 French hens, 22 turtle doves, and 12 partridges in a pear tree (or 12 partridges in 12 pear trees, you be the judge).

It's a classic trick arithmetic question that we were asked in high school. We had to solve it algebraically, and most people figured that we would receive *sum from n=1 to 12*(n) presents, instead of *sum from n=1 to 12*(n^2 - 13n)

Matthew