So what that means is, if we are only considering these two ions, and if we assume that the membrane is impermeable to either one of these ions, that means all these ion channels are actually closed. And if we omit, if we neglect all the other ions to calculate the actual resting memory potential, all we have to do is find the average of these two values. And so the average of these two values is about negative 18 millivolts. So we can basically approximate this to around negative 20 millivolts. Now, the question is, why then is the resting memory potential of our resting neuron negative 70 millivolts? Why isn't it this quantity?