Three people of different heights are to be seated on a bench. How many different sitting arrangements are possible if the tallest one and the shortest one must sit next to each other ?	Choose the correct choice.
A) 2	B) 4	C) 6	D) 8	E) 10
Consider T and S one. But, in this arrangement they can sit in two different combinations.   T first and S second or S first and T second.   Total we have (T and S) and third person= 2 arrangements to do.   Total arrangements= 2*2= 
<gadget id="calculator">2*2</gadget>
<output>4</output>
4   4 is the answer
<result>B</result>
Three people of different heights are to be seated on a bench. How many different sitting arrangements are possible if the tallest one and the shortest one must sit next to each other ?