So heads and heads gives us a probability of one four which is exactly what we obtained by simply multiplying these two values. So we can either do it this way or we can actually use the punished square. Now let's move on to example number two which involves slightly more with genetics because we're using not coin flips but we're producing children. So find the probability of two parents, a female and a male, producing two children who are both female. Now essentially example number two is exactly like example number one, except instead of using tails and coin flips we're using children. So event number one is having the first child and the two outcomes are either a boy or a girl.