Question

determine whether the following problem involves a permutation or combination. (it is not necessary to solve the problem.)
how many different 2 - letter passwords can be formed from the letters s, t, u, w, x, y, and z if no repetition of letters is allowed?
the problem involves a
because the
of letters selected
matter.

Explanation:

A permutation is an arrangement of objects where the order matters. In the case of passwords, the order of the letters matters (e.g., "ST" is a different password than "TS"). Since we are forming 2 - letter passwords from a set of letters and the order of the two - letter selection matters, this is a permutation problem.

Answer:

This problem involves a permutation because the order of letters selected matters.