Summation Notation Practice

1. $\large\displaystyle\sum\limits_{k=1}^{2 }{{(3-k)}}=$

2. $\large\displaystyle\sum\limits_{n=0}^{2 }{{(-n)}}=$

3. $\large\displaystyle\sum\limits_{x=1}^{2 }{{(6x)}}=$

4. $\large\displaystyle\sum\limits_{n=0}^{2 }{{(n)}}=$
   

Source: Khan Academy, https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:series/x9e81a4f98389efdf:geo-series-notation/e/evaluating-basic-sigma-notation
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