The sum of the first 
terms is ![\displaystyle\boldsymbol{S_n = \frac{2} \big[2a + (n - 1)d\big]}](https://deekshalearning.com/wp-content/ql-cache/quicklatex.com-3099ceb6b3f3865428869ce2edad5daf_l3.png "Rendered by QuickLaTeX.com")
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