Preordain calculates probability distributions for cards games, such as Magic: the Gathering, and Poker. You enter the number of cards in the deck, the number of good cards, and the number of cards you are drawing, then Preordain calculates the probability of drawing each possible number of good cards.
Preordain is simple to use, and allows you to easily sum probabilities. Finding your chances of drawing between 2 and 5 lands in an opening 7 card hand is just a few swipes and taps away.