Mudcat Café message #152581

The Mudcat Café ^TM
Thread #16362 Message #152581
Posted By: Joe Offer
21-Dec-99 - 05:13 PM
Thread Name: Twelve Days of Christmas-for teaching catechism?
Subject: RE: Twelve Days of Christmas

Now, that's one part of mathematics that escaped me, and gave me trouble on all those standard exams. What's the formula for finding the sum of 12 + 11 + 10 + 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1 AND 11 + 10 + 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1, etc., down to 1???
-Joe Offer-