Chapter 12.1, Problem 61AYU

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

$1+2+3+\mathrm{...}+20$

To determine

To find: The sum using summation notation: $1+2+3+\dots +20$.

Answer to Problem 61AYU

$1+2+3+\dots +20={\displaystyle \sum }_{\text{k }=1}^{20}\text{k}$

Explanation of Solution

Given:

$1+2+3+\dots +20$

Calculation:

$1+2+3+\dots +20={\displaystyle \sum }_{\text{k }=1}^{20}\text{k}$