Day 16: Sum and Difference

Algebra Level 3

\[\sum\limits_{x=1}^{25} (x + 1)(x - 1)\] can be written as \(25k\), where \(k\) is an integer. Find the value of \(k\).

This problem is part of the set Advent Calendar 2014.

×

Problem Loading...

Note Loading...

Set Loading...