That's actually a telescoping sum. Do you know what a telescoping sum is?
Just starting off learning summations, and I'm looking to find if there is an easier way to solve this problem.
The sum is k = 4, up to 24, sorry didn't know how to put it in for latex.
I know what it's asking, but surely there is a faster way than manually substituting in values and adding.
Any help is appreciated.