The prime minister of a country and 4 other dignitaries are scheduled to sit in a row on the 5 chairs represented above. If the prime minister must sit in the center chair, how many different seating arrangements are possible for the 5 people?
Choose the correct answer.
A) 4	B) 24	C) 20	D) 21	E) 120
IMO B   Given that one chair is taken, i think the remaining 4 dignitaries can be arranged 4!. That is 4*3*2*1= 
<gadget id="calculator">4*3*2*1</gadget>
<output>24</output>
24.
<result>B</result>
The prime minister of a country and 4 other dignitaries are scheduled to sit in a row on the 5 chairs represented above. If the prime minister must sit in the center chair, how many different seating arrangements are possible for the 5 people?