Question

The arithmetic sequence ; is defined by the a i formula : a 1 =-4910 a i =a i-1 +8 Find the sum of the first 575 terms in the sequence.

Answer 1

- 1,503,050

Explanation:

Given that the sum of arithmetic sequence =

n/2[2a + (n-1)d]

Where;

n = 575

a = -4910

d = a i - a i-1 = 8

Substituting values;

575/2 [2(-4910) + (575 -1) 8]

575/2 [(-9820) + 4592]

= - 1,503,050