There are 4 couples. If they will sit 8 chairs in a row such that each couple sits side by side, how many possible cases are there?
Answers: A) 120 B) 384 C) 1,200 D) 2,460 E) 3,840
Tie the couples. Then we have 4 persons that have to be arranged in 4 places. 4! ways.   Now the couples can change position with each other. 2! ways.   4! * (2!)^4 = 24 *16= 
<gadget id="calculator">24 *16</gadget>
<output>384</output>
384   Answer is B.   5! * 2!= 240 ways.
<result>B</result>
There are 4 couples. If they will sit 8 chairs in a row such that each couple sits side by side, how many possible cases are there?