There are 6 books on a shelf, of which 2 are paperbacks and 4 are hardbacks. How many possible selections of 4 books from this shelf include at least one paperback?	Select the correct option.
A) a) 40 B) b) 14 C) c) 50 D) d) 55 E) e) 60
approach 1   at-least 1 paper back = total - no paper back   6c4-4c4 = 14   approach 2   at-least 1 paper back = 1 paper back , 3 hard back or 2 paper back 2 hard back   = 2c1*4c3+2c2*4c2 = 14   Answer is b) 14
<result>B</result>
There are 6 books on a shelf, of which 2 are paperbacks and 4 are hardbacks. How many possible selections of 4 books from this shelf include at least one paperback?