identify-the-first-four-terms-and-the-last-term-also-evaluate-the-sum-using-the--1

Question

Identify the first four terms and the last term. Also, evaluate the sum using the formula S_{n} = (n/2)(a_{1} + a_{n}).

Accepted Answer

first four terms: 3, -2, -7, -12; last term: -162; sum: -2703

Answer

first four terms: 3, -2, -7, -12; last term: -162; sum: -2541

Answer

first four terms: 3, 11, 19, 27 ; last term: 162; sum: 2891

Answer

first four terms: 3, 11, 19, 31 ; last term: 164; sum: 2757

Identify the first four terms and the last term. Also, evaluate the sum using the formula Sn = (n/2)(a1 + an).