Answer:
[tex]s = \frac{n}{2} (f + l) \\ = \frac{200}{2}(1 + 200) \\ \boxed{ s = 20100 }[/tex]
Step-by-step explanation:
where n : is the number of terms...
f: is the first term
l: is the last term
s: is the sum of all terms...
