sum of the terms of an arithmetic sequence
- Let (`u_(n)`) be an arithmetic sequence of common difference -8, and of first term `u_(0)= 3`. Let S be the sum of `u_(5)` to `u_(14)`. S=`u_(5)`+`u_(6)`+`u_(7)`+`. . .`+`u_(14)`.
- Compute the number of terms in S.
- Compute S.
Course reminder : Numerical sequences