Question 1143238
A.{{{(5!/6!)}}}- Supposed there will be only 1 for the fifth place then the remaining 5 shall be ocuupied by order of 5!. To illustrate, 5-4-3-2-1-1. And of course, the arrangement for the sample space is 6!. Since we consider the total nunber of events.

B.{{{(3!/6!)}}}-Same principle applied with letter A.

C. Since we specify on how we situate the persons there should be 1/6! Likewise, bserve that there is 1 1 1 1 1 1 sequence

D.{{{(2*4!)/(6!)}}}-2 persons A or D can occupy the first performance and the rest shall be arranged accordingly by 4!