I think "The Poker of" means Four of a kind
And there is 7 cards from which 5 are your best hand
( 2 cards in your hands + 5 cards on the table )
so in this case for example

Your hands -> K + 7
Table -> 2 + 4 of Jacks
Opponents hands -> 6 + 8

In this case Your best hand of 5 from avalible 7 cards would be -> 4xJ + K, and your opponents would be -> 4xJ + 8 and you will win
So this case is possible :)

[C#]
Please fix naming to PascalCase