We can get a boy and a boy or a girl, a girl and a girl or a boy. So we can have four different possibilities as we'll see in just a moment. And these different events, two events are independent of one another in the same way that these two coin flips were independent of one another. So to demonstrate this a bit more, let's actually take a look at example number one and example number two. So in example number one we want to use the product rule, this rule here to basically determine the probability of obtaining two consecutive heads on two coin flips. So basically what that means is we have to apply the product rule.