There are 5 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 choice from the following answers: A) 90 B) 120 C) 150 D) 180 E) 200
Number of ways of selecting 2 fiction books = 51502   Number of ways of selecting 2 non fiction books = 61502   51502 * 61502 = 10 * 15= 
<gadget id="calculator">10 * 15</gadget>
<output>150</output>
150   Answer: 150
<result>C</result>
There are 5 fictions and 6 non-fictions. How many cases are there such that 2 fictions and 2 non-fictions are selected from them?