unfair_coin.rb

def toss
  (rand * 100) > 60 ? 1 : 2
end

# Both players bet on 1
def game
  toss_1 = toss()
  toss_2 = toss()

  if toss_1 == 1 && toss_2 != 1
    return 1
  elsif toss_2 == 1 && toss_1 != 1
    return 2
  else
    return game()
  end
end

h = 1_000_000.times.map { game() }.inject(Hash.new(0)) do |h, n|
  h[n] += 1
  h
end

p h
# {2=>499985, 1=>500015}