http://i.imgur.com/iSeHu.jpg

Just Part I. I had (8! x 3!)/10 ; and the answer says (7! x 3!).

Could someone explain to me which one is right and why please?

Thank You.

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- August 3rd 2012, 04:54 AMeskimogeniusCommittee of People Rotated Around a Table
http://i.imgur.com/iSeHu.jpg

Just Part I. I had (8! x 3!)/10 ; and the answer says (7! x 3!).

Could someone explain to me which one is right and why please?

Thank You. - August 3rd 2012, 05:48 AMhemvaneziRe: Committee of People Rotated Around a Table
Let us consider an arrangement where the teenagers sit together.

The rest of the seven persons who are not teenagers can be arranged in 7! ways

The three teenagers can themselves sit in 3! ways.

therefore the total number of arrangements are

7!X3!