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작성자 스와니사랑 작성일 14-12-16 22:44 조회 1,976 댓글 1본문
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The Twelve Days of Christmas is a popular holiday song. If this song were true and “my true love” gave me gifts each day, as the song says, how
many total gifts would I have received after 12 days? Bonus: can you find a formula to figure out the answer? Here is a list of each days gifts, for
example, on the third day of Christmas my true love gave to me: 3 french hens, 2 turtle doves, and a partridge in a pear tree.
1 partridge in a pear tree 2 turtle doves 3 French hens 4 calling birds 5 gold rings 6 geese a-laying 7 swans a-swimming 8 maids a-milking 9 ladies dancing 10 lords a-leapin’ 11 pipers piping 12 drummers drumming
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Heineken3 작성일http://www.intmath.com/blog/mathematics/the-twelve-days-of-christmas-how-many-presents-1686