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# Changes

From Genome Analysis Wiki

→Getting the index of a genotype in an enumerated list given a ploidy and alleles

</math>

So when <math>a_k=0</math>, the binomial coefficient reads as <math>\binom{k-1}{k}</math> which ~~is ~~equals ~~to ~~0 since there are 0 ways to choose k items from k-1 items.

= Simple cases =