13 different biology books and 8 different chemistry books lie on a shelf. In how many ways can a student pick 2 books of each type? Choose the correct choice from the following answers: A) 80 B) 160 C) 720 D) 1100 E) 2184
No. of ways of picking 2 biology books(from 13 books) = 13c2 = (13*12)/2= 
<gadget id="calculator">(13*12)/2</gadget>
<output>78</output>
78   No. of ways of picking 2 chemistry books(from 8 books)= 8c2 = (8*7)/2= 
<gadget id="calculator">(8*7)/2</gadget>
<output>28</output>
28   Total ways of picking 2 books of each type= 78*28= 
<gadget id="calculator">78*28</gadget>
<output>2_184</output>
2184   (Option 2184)
<result>E</result>
13 different biology books and 8 different chemistry books lie on a shelf. In how many ways can a student pick 2 books of each type?