So we have one half times one two gives us one four and we have one half. So once again we have one fourth and we have one four. And this makes sense because if we sum up these four values it has to add up to one or 100%. So 00:25 plus zero point 25 plus zero point 25 plus zero point 25 gives us a total of one. So notice that these probabilities are the probabilities of these events taking place. So either we get heads and heads or we get heads and tails or tails and heads and tails and tails.