Find the sum of the first n terms of the following arithmetic sequence.
-$$a _ { 1 } = - 96 , d = - 8 ; \quad n = 10$$
A) $- 600$
B) $- 840$
C) $- 1320$
D) 840

Question

Quizplus · Accepted Answer

The sum of the first n terms of an arithmetic sequence is given by the formula $ S_n = \frac{n}{2} (2a_1 + (n-1)d) $. Substituting the given values: $ S_{10} = \frac{10}{2} (2(-96) + (10-1)(-8)) = 5(-192 - 72) = 5(-264) = -1320 $.

Find the Sum of the First N Terms of the Following