Answer
$S_{250}=31375$
Work Step by Step
The first n term of an arithmetic sequence can be calculated as:
$S_n=\frac{n}{2}(a_1+a_n)$
We have to find the sum of the first 250 natural numbers.
$a_1=1$
$a_{250}=250$
Therefore we can substitute in the formula of the sum, and we get:
$S_{250}=\frac{250}{2}(1+250))=125\times251=31375$
