11 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 option.
A) 80	B) 160	C) 720	D) 1100	E) 1540
No. of ways of picking 2 biology books(from 11 books) = 11c2 = (11*10)/2= 
<gadget id="calculator">(11*10)/2</gadget>
<output>55</output>
55   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= 55*28= 
<gadget id="calculator">55*28</gadget>
<output>1_540</output>
1540   (Option 1540)
<result>E</result>
11 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?