Can someone explain this answer to this genetics problem?

Question

What is the probability that, in an organism with a haploid number of 10, a sperm will be formed which contains all 10 chromosomes whose centromeres were derived from maternal homologs?

A: (1/2)^10 - Does this mean 1 out of the 2 chromosomes to the power of the haploid number?

Answer 1

Yes, that is what it means.

So first look at the chance to get the maternal chromosome for any one of the 10 chromosomes.... (1/2).

Then look at the chance of all 10 being maternal:

(1/2)^10

Answer 2

The number of haploid cells that can be generated is equal to 2^n where n is the haploid number.  There is only 1 way that you can have only chromosomes with centromeres derived from maternal homologs, therefore the probability is 1/2^10.