Please tell us what is meant by a selection?

POST SCRIPT:

I made a guess as to what this question means.

If one expands

we get a polynomial of degree 19.

Each coefficient in the expansion tell the number of possible selections.

For example: the term in the expansion tells us that there are 191 ways to select nine items from that list.

If we sum all the coefficients we get .

But that includes the empty selection.

Remove it and there is