Answers: 2
![S_n=\frac{n}{2}[2a+(n-1)d]\\](/tpl/images/0125/8402/f7401.png)
![S_{12}=\frac{12}{2}[2*22+(12-1)2]\\ \\ S_{12}=6[44+22]\\ \\ S_{12}=6*66\\ \\S_{12}=396\\](/tpl/images/0125/8402/a231f.png)
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Find the sum of the even integers between 21 and 45...
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