Answer: 378,885
Explanation:
We could just add it all up but there is a simple easy formula :D
n(n + 1)/2 = Sum of Integers
We make n be the biggest number in the sequence. n=870 then
870(870 + 1)/2 = 378,885
Just by using a simple formula, we were able to calculate the sum very quickly.
I hope this helps!