What that means is this will be closer to this value than to this value. And that's exactly why it's around negative 70 millivolts, which is closer to this than to this value. So we see that in the absence of other ions, and assuming all ion channels are closed and the membrane is impermeable to either one of these ions, in such a case, the resting memory potential would simply be the average of these two values, which is around negative 20 millivolts. But that is not the case. Why? Well, it turns out that some of the K plus ion channels are actually open, so they're more permeable to the K plus then the sodium channels are permeable to the N A plus.