You missed the "non-negative integers" requirement.

why does it need to be converted to integer? Shouldn't count() automatically return only integers?

Something ain't right when 2 comes before n haha.

Most likely because whoever wrote this didn't realize it can be solved in O(1). Or because this kata is listed in the section "LINQ excercises" so the author tried to solve it using System.Linq library. I don't think it can be solved in O(1) using language integrated query.

Sets the name (alias) of result column.

What does "as mod" do?

bajarildi

I'm an Oracleish guy and you made my day (window functions on the same level as grouping function)

This feels like a 10 kyu kata.

just started learning C#, any feedback is welcomed!!

I understand that this is a kata for very beginners. Still I believe that you should put more simple mistakens in the code to be corrected, like removing a ";", mistyping some keywords or something else.

"Too easy, skip" perhaps ;-)

7 skips?!

This kata is basically a duplicate to the entry test, Multiply.

You're kidding me lol (of course)