Question
Find the sum of the first 1000 positive integers.
✓
Answer
$S_n= \frac { n } { 2 } [ a + l ]$
$\Rightarrow S_{1000}= \frac { 1000 } { 2 }[1 + 1000] = 500500$
$\Rightarrow S_{1000}= \frac { 1000 } { 2 }[1 + 1000] = 500500$
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