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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!

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12y ago
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Q: What is the sum of the consecutive integers from 23 to 123?
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