I have no idea how to go about solving number 2. I think I figured out part a but everything else is very confusing. I just learned the formulas [math]_nP_r[/math] and [math]n!/(n-r)![/math] for non repeating objects and [math]n!/r_1!r_2!r_3!...[/math] for repeating objects. But I don't know how to use these formulas to apply to question 2.
Any help would be so so so appreciated.
Any help would be so so so appreciated.