There are five same model cars parked in the same direction in parking. If 3 cars are red, 1 is black and 1 is green, in how many ways they can be arranged in the parking?
Choose the correct choice from the following answers:
A) 10 ways.
B) 20 ways.
C) 30 ways.
D) 40 ways.
E) 50 ways.
5!/(3!*1!*1!) = (5*4*3*2*1)/(3*2*1) = 120/6= 
<gadget id="calculator">120/6</gadget>
<output>20</output>
20 ways.   ANSWER:20 ways.
<result>B</result>
There are five same model cars parked in the same direction in parking. If 3 cars are red, 1 is black and 1 is green, in how many ways they can be arranged in the parking?