Heads or tails

headsortails.rb

# Shows all the possibilities of a set of coins throwing
# You could as well change "heads" and "tails" for true and false.

def possibilities(a)
  results = []
  
  if(a==1)
    results << ["heads"]
    results << ["tails"]
  else
    possibilities = possibilities(a-1)
    possibilities.each do |possibility|
      results << (possibility + ["heads"])
      results << ( possibility + ["tails"])
    end
  end

  return results
end