'm a little bit unsure how to approach this problem of permutations when you add categories:
Each object can contain 3 attributes out of the 10 possible available.
Because order doesn't matter, there would be 10 x 9 x 8 = 720 possible choices. If duplications of attributes don't matter (eg. you can have 3 of the same attribute), then there will be 10 x 10 x 10 possible choices. This part is easy.
But what I don't understand, is what happens if this object can randomly come from any of 30 countries? And what if this object can be of any 5 sizes? (These are not attributes mentioned before)
How many possibilities are there?