Stephanie is packing her bags for her vacation. She has 7 unique books, but only 3 fit in her bag.
How many different groups of 3 books can she take?

This is what i found “an explicit formula designates the nth term of the sequence, as an expression of n (where n = the term's location). it defines the sequence as a formula in terms of n. this example is an arithmetic sequence(the same number, 5, is added to each term to get to the next term).” i hope this you for what your looking for. can you plz mark me brainliest?

Dcups i think