Find a formula for the n 4 4 + ... - 4 + ... and use it to find the series' sum if the series converges. partial sum of the series 4 - +(- 1)" -1, 7n-1 7 49 343 The formula for the n partial sum, s,...

Extracted text: Find a formula for the n 4 4 + ... - 4 + ... and use it to find the series' sum if the series converges. partial sum of the series 4 - +(- 1)" -1, 7n-1 7 49 343 The formula for the n partial sum, s, of the series is. If the series is convergent, what is the series' sum? Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. The series is convergent, and the sum is (Type an integer or a simplified fraction.) O B. The series diverges.