There are 9 fictions and 6 non-fictions. How many cases are there such that 2 fictions and 2 non-fictions are selected from them?
Choose the correct option.
A) 90
B) 120
C) 540
D) 180
E) 200
Number of ways of selecting 2 fiction books = 95402   Number of ways of selecting 2 non fiction books = 65402   95402 * 65402 = 36 * 15= 
<gadget id="calculator">36 * 15</gadget>
<output>540</output>
540   Answer: 540
<result>C</result>
There are 9 fictions and 6 non-fictions. How many cases are there such that 2 fictions and 2 non-fictions are selected from them?