In how many ways can 5 white and 2 black 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) 120 B) 60 C) 10 D) 240 E) 30
5 white chess pieces can be arranged in 5! ways and 2 black pieces can be arranged in 2 ! ways.   W_W_W_W   Number of ways = 5!*2! = 120 * 2= 
<gadget id="calculator">120 * 2</gadget>
<output>240</output>
240   Answer 240
<result>D</result>
In how many ways can 5 white and 2 black chess pieces be arranged in a row such that they occupy alternate places? Assume that the pieces are distinct.