In how many ways can a group of 20 friends be seated round 2 tables if one of the tables can seat 12 and the other can seat 8 people?  Choose the correct choice:
A) 15C5 * 9! *4!  B) 15C3 * 8! *3!  C) 20C4 * 11! * 7!  D) 21C2 * 10! *3!  E) 25C5 * 10! *4!
12 people can be selected from 20 people in 20C12 ways.   Remaining 8 people can be selected from 8 people in 8C8 ways.   Now, arranging 12 people on a round table = (12-1)= 
<gadget id="calculator">(12-1)</gadget>
<output>11</output>
11!   Arranging 8 people on a round table= (8-1)= 
<gadget id="calculator">(8-1)</gadget>
<output>7</output>
7!   Hence, total number of ways= 2020C4 * 11! * 7!12 * 11! * 820C4 * 11! * 7!8 * 7!   = 2020C4 * 11! * 7!4 * 11! * 7!   20C4 * 11! * 7!
<result>C</result>
In how many ways can a group of 20 friends be seated round 2 tables if one of the tables can seat 12 and the other can seat 8 people?