It could be used "String.Concat(text.Select(...))" instead of join and nested ternary expressions usually frowned upon.

Please add test case when two flushes and there are difference between pairs. There are solution that passed ignoring this corner case. Like so:

var expected = new List<PokerHand> {
    new PokerHand("2D 2D 3D 5D 7D"),
    new PokerHand("AT 3T 3T 5T 6T")
};

Hello, could you teach me how or where to find the Taylor series formula? I have used numerical methods to solve this task which worked for me.

There is an issue when N == Size test it expecting for "Not enough participants" result, though there are enough participants. So i tweaked my solution N - 1 like that it worked, but i think the test might be wrong.

Excuse me, where can i get information which library are available in js in codewars?

fixed.