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The sum of 123 and 654 is 777.
The sum of 123 is 123.
120+80
7272 * * * * * WRONG! Sum from 23 to 123 = (sum from 1 to 123) minus (sum from 1 to 22) = 123*124/2 - 22*23/2 = 7626 - 253 = 7373. NOT 7272!
113+7+3 = 123