Answer:
It’s true: both numbers go to infinity. The number of possible parallel Universes tends to infinity, but does so at a particular (exponential) rate, but the number of possible quantum outcomes for a Universe like ours also tends to infinity, and does so much more quickly. As both mathematicians and John Green fans know, some infinities are bigger than others.
What this means is that, unless inflation has been occurring for a truly infinite amount of time, there are no parallel Universes out there identical to this one. The number of possible outcomes from particles interacting with each other increases faster than even the number of possible Universes arising from inflation; even an inflating multiverse isn’t large enough to hold the parallel Universes you’d need for the many-worlds interpretation of quantum physics to put all of its alternate timelines.
