One day I was wondering what the probability of a blackjack hand was and did not feel like googling it, (as that was way too simple and would make my life way to easy).

By inputting the amount of rounds an answer in median and % chance of a blackjack can be calculated.
Streaming multiple games makes for a better answer to the question and gives a more accurate result.
Multithreading is also an option for faster calculations (sometimes).