In how many ways can 4 black and 5 white chess pieces be arranged in a row such that they occupy alternate places? Assume that the pieces are distinct. Choose the correct choice from the following answers:  A) 20  B) 1440  C) 120  D) 2880  E) 720
4 black chess pieces can be arranged in 4! ways and 5 white pieces can be arranged in 5 ! ways.   W_W_W_W   Number of ways = 4!*5! = 24 * 120= 
<gadget id="calculator">24 * 120</gadget>
<output>2_880</output>
2880   Answer 2880
<result>D</result>
In how many ways can 4 black and 5 white chess pieces be arranged in a row such that they occupy alternate places? Assume that the pieces are distinct.