sum of the terms of an arithmetic sequence
- Let (`u_(n)`) be an arithmetic sequence of common difference -5, and of first term `u_(0)= 1`. Let S be the sum of `u_(0)` to `u_(26)`. S=`u_(0)`+`u_(1)`+`u_(2)`+`. . .`+`u_(26)`.
- Compute the number of terms in S.
- Compute S.
Course reminder : Numerical sequences