Given 20 people, how many ways are there to form a committee containing at least three people?
is one answer but a shorter calculation would be .
Does this look correct?
Hello, oldguynewstudent!
Given 20 people, how many ways are there to form
a committee containing at least three people?
is one answer but a shorter calculation would be .
Does this look correct? . . . . um, not quite
I assume you mean: .
Also, the alternate way is: .