Question

A bin contains 100 sty le a notebooks, 100 style b notebooks, and 100 style c notebooks. antoine will select 3 notebooks from the bin. how many different selections of 3 notebook styles are possible?

Answer 1

The answer is Ten.  Substituting numbers for letters, available selections are 111, 112, 113, 122, 123, 133, 222, 223, 233, 333.  Note that, for example, 112, 121, and 211 are considered as the same selection.
AAA, BBB, CCC, AAB, AAC, BBC, ABB, ACC, CCB & ABC.