// Functions for predicting lottery or Keno probabilities.

// balls is the number of total balls to draw from
// drawn is the number of balls actually drawn from the above pool
// chosen is the number of balls chosen by the player
// matches is the number of balls chosen by the player that match drawn balls
lottery[balls, drawn, chosen, matches] :=
{
   binomial[balls,drawn] / (binomial[chosen, matches] * binomial[balls-chosen, drawn-matches])
}