Question 1191164
<pre>
a. if A and B are best friends that must be seated beside each other

Arrange 5 "things" {AB, C, D, E, F} 5 ways (5 things POSITION 5 ways)
OR
Arrange 5 "things" {BA, C, D, E, F} 5 ways (5 things POSITION 5 ways)

(5 POSITION 4) x 2


b. if A and B are ENEMIES that must be seated apart from each other. 

Subtract 

(6 POSITION 6) - (the result of part a)

Edwin</pre>