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to find the numbers between two numbers use this formula and reblace the a with the smaller number and b with the larger number

((b^2+b)/2-b)-((a^2+a)/2)

so the answer is 135 not including 20 as part of the sum

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Q: What is the sum of numbers between 10 and 20?
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Related questions

What is the sum of all composite numbers between 10-20?

The sum is 75.


What is the sum between -5 and 20?

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