lottery.rb

class LotteryTicket
  NUMERIC_RANGE = 1..25

  attr_reader :picks, :purchased

  def initialize(*picks)
    if picks.length != 3
     raise ArgumentError, "You must pick three numbers"
    elsif picks.uniq.length != 3
     raise ArgumentError, "You must pick three unique numbers"
    elsif picks.detect {|p| not NUMERIC_RANGE === p}
     raise ArgumentError, "You must pick a number between 1 and 25"
    end
    @picks = picks
    @purchased = Time.now
  end

  def self.new_random
    new(rand(25) + 1, rand(25) + 1, rand(25) + 1)
  rescue ArgumentError
    retry
  end
end

class LotteryDraw
  @@tickets = {}
  def LotteryDraw.buy(customer, *tickets)
    unless @@tickets.has_key?(customer)
      @@tickets[customer] = []
    end
    @@tickets[customer] += tickets
    @@tickets
  end
end

p LotteryDraw.buy 'Zachary Gershman', LotteryTicket.new_random, LotteryTicket.new_random, LotteryTicket.new_random

@@tickets at the end offers a return of the hash. Could have added a reader method as well.