If 100 people can choose any number of combinations from a set of 90 options, where each option can only be selected once, but each person can select any number of options.
Say there is a product sortiment of 90 different products, [a, b, c...]
Each person can choose any combination of products, but can only choose each product once. So for example a person can choose [a] or [a, b, f, g] but not [a, a, c].
Now if 100 people has to make a selection and each selection doesn't affect other peoples selections. How many combinations does this equal?
EDIT: I forgot to add: [a, b, c] and [b, a, c] should count as the same combination.