Find the sum of the series : 1.n + 2.(n – 1) + 3.(n – 2) + ….. + (n – 1).2 + n.1.

https://www.vedantu.com/question-answer/find-the-sum-of-the-series-1n-+-2n-1-+-3n-2-+-+-class-11-maths-cbse-5f34d4da5597f32583a5adca

use mahoney's work to improve the algorithm.