We have to construct all possible unique combinations. Again you can multiply this number out by the number of persons now living 7 billion or the number that have ever lived 108 billion to get another very large number. What is the formula.
1M and 1P 2M and 2P and 3M and 3P.
What is the formula. As a result two gametes virtually never have exactly the same combination of chromosomes. The way to work it out is always 2 to the power of the haploid number. Hope its clear to you.