# SOLUTION: How do you solve the number of gifts given in the 12 Days of Christmas algebraically using a progression formula? The answer is not 78. Thanks

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 Question 25617: How do you solve the number of gifts given in the 12 Days of Christmas algebraically using a progression formula? The answer is not 78. ThanksAnswer by fractalier(2101)   (Show Source): You can put this solution on YOUR website!The sum of n consecutive integers, starting with one, is S = [n(n+1) / 2] so that for n = 12, we have S = (12)(13) / 2 = 78 That IS the answer if you give one on the 1st day, two on the 2nd, etc...