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The sum from 1 to n is n*(n+1)/2

In this case that mean 20*21/2 = 210

The sum from 1 to n is n*(n+1)/2

In this case that mean 20*21/2 = 210

The sum from 1 to n is n*(n+1)/2

In this case that mean 20*21/2 = 210

The sum from 1 to n is n*(n+1)/2

In this case that mean 20*21/2 = 210

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12y ago

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The sum from 1 to n is n*(n+1)/2

In this case that mean 20*21/2 = 210

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Wiki User

12y ago
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Q: How do I find the sum of 1 to 20?
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