At a certain meeting of 25 people, they decide to select a committee, which would have a chairman and 2 members. How many ways are there to do it?

There are 25 ways to choose the chairman followed by $24C2$ to choose the two remaining members. So the answer would be $25 * 24C2$ = 6900.

I just wanna double check this is the right way to do it. Thanks!

  • 1
    $\begingroup$ Yes, that's the right way. The explanation is clear, but I would prefer "For each way of choosing the Chair, there are $\binom{24}{2}$ ways $\dots$." $\endgroup$ – André Nicolas Oct 16 '15 at 0:00
  • $\begingroup$ Okay thanks for the clarification $\endgroup$ – person112358 Oct 16 '15 at 0:02
  • $\begingroup$ Can also think of as ${25 \choose 3} \cdot 3$, also equal to 6900, e.g. first choose the 3 members without a chair; for each of these triples there are 3 chaired committees. $\endgroup$ – Circulwyrd Oct 16 '15 at 0:14

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.