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Instead of adding each digit in turn, acknowledge that there are 100 numbers to add, and then multiply that by the average of 1 and 100.

Ie. 100×(1+100)÷2=100×101;÷2

100×101;÷2=50×101=5050



So, in short, the answer is: 5050

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โˆ™ 2009-06-03 12:01:42
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Q: What do you get if you add up all the integers from 1 to 100?
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