Three people are to be seated on a bench. How many different sitting arrangements are possible if Erik must sit next to Joe?  Answers:
A) 2.
B) 4.
C) 6.
D) 8.
E) 10.
Possible combinations can be   1. Erik Joe X   2. X Erik Joe   3. Joe Erik X   4. X Joe Erik   Hence, answer is 4..
<result>B</result>
Three people are to be seated on a bench. How many different sitting arrangements are possible if Erik must sit next to Joe?