Need Clarification on MW

```I've done a little more research on MWI and QTI, and I have a few questions.
First of all, there is a theorem which states that choosing a random
number out of a set of n numbers, labelled 1 to n, will give a general idea
of the size of the set.  For example, if the randomly chosen number is 7,
you can deduce that there is a high probability that the set does not
consist of very many numbers.  But if you choose 1 billion, you know the set
is very large.  This principle, I assume, (and read about, called the
Doomsday Principle), applies to us.  Assuming you are an SAS, randomly
assigned to a single concioucness within this universe, then you must either
assume:
1.  The set of past SAS's is infinite, and therefore there must have been
SAS's before the big bang.
or,
2.  The set of future SAS's is finite.
If you do not assume either of these, then you must assume that the set of
past SAS's is finite, and the set of future SAS's is infinite. But the
chance of being randomly assigned to an SAS that does not live in a time
that has an infinite future and past set of SAS's is infinitely small, and
So either life has been going on forever and will always go on, or it
started at a certain point and will end at a certain point (which goes
against MWI).
Is this a proof that life has always existed?```
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Second question: when people talk about the quantum suicide experiment, they
talk about it as though only one universe, or only the likely ones, are
real.  For example, some people say that the only thing stopping them from
committing quantum suicide is that they'll be leaving behind loved ones in
the universe in which they did die.  But if every universe is real, then it
doesn't matter, because that universe will exist whether they commit quantum
suicide or not.  It sounds like they are assuming that only two worlds are
real: the one in which they leave behind loved ones, and the one in which
they still survive.  What is the right way to look at this?

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