A round table conference to be held between 20 delegates of 20 countries. In how many ways can they seated if two particular delegates are always to sit together?	Choose the correct answer:  A) 14!*5!  B) 22!*7!  C) 18!*2!  D) 28!*1!  E) 16!*3!
Regarding two particular delegates who are to sit together as on one person, we have only   18+1= 
<gadget id="calculator">  18+1</gadget>
<output>19</output>
19 persons.these 19 persons can be seated at the round table in 18! ways.   But two particular persons can be arranged among themselves in 2! ways.   Required number=18!*2!   Answer is 18!*2!
<result>C</result>
A round table conference to be held between 20 delegates of 20 countries. In how many ways can they seated if two particular delegates are always to sit together?