If A1 = - 25 S3 = S8 in {an} is known, then the minimum value of the first n terms and Sn is? 2 LG (A1) + LG (A2) +... In the sequence {an} +LG (A10) = 5 and LG (а n + 1) - LG (an) = 1 Find an =?

If A1 = - 25 S3 = S8 in {an} is known, then the minimum value of the first n terms and Sn is? 2 LG (A1) + LG (A2) +... In the sequence {an} +LG (A10) = 5 and LG (а n + 1) - LG (an) = 1 Find an =?

1. Let the tolerance be D, and S3 = S8 has: - 25 * 3 + (3 * 2 / 2) d = - 25 * 8 + (8 * 7 / 2) d d = 5, so the largest non positive number term an = a1 + (n-1) d = 5n-30 ≤ 0, so n = 6, so the minimum value of the first n term and Sn is: S6 = (a1 + A6) * 6 / 2 = - 752.2 LG (A1) + LG (A2) + +LG (A10) = 5 and LG (а n