A church has 10 bells in its bell tower. Before each church service 7 bells are rung in sequence. No bell is rung more than once. How many possible sequences are there?

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?