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Q 61.

Expert-verifiedFound in: Page 809

Book edition
6th

Author(s)
Sullivan

Pages
1200 pages

ISBN
9780321795465

In Problems 61–70, express each sum using summation notation.

$1+2+3+...+20$

The required summation notation is $1+2+3+...+20=\sum _{k=1}^{20}k$.

The given sum is:

$1+2+3+...+20$

As we can see that the sum $1+2+3+...+20$ has 20 terms, each term represents the form $k$, and starts at $k=1$ and ends at $k=20$.

Therefore, $1+2+3+...+20=\sum _{k=1}^{20}k$.

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