Question 1135864
.
Four couples are seated on a bench. Find the number of ways a particular couple {{{highlight(cross(must))}}} <U>can</U>:


<pre>
(a)  Sit together.         <U>ANSWER</U> :  2*((4-1)*2+1)! = 2*7! = 2*5040 = 10080.



(b)  No sit together.      <U>ANSWER</U> :  8! - 10080 = 30240.

                                     The complement set to (a).
</pre>