Finding Allele Frequencies for Multiple SNPs

Question

[gtasource]

Let’s say I have 10 known SNPs and I want to calculate what percentage of the population has all 10 of the risk alleles associated with these SNPs. Anybody know of any tools are calculations for this?

Furthermore, how could I go about finding the population frequencies of the 10, and then removing 1, finding the population of the remaining 9, remove another one, etc.

Thanks!