10 books are placed at random in a shelf. The probability that a pair of books will always be together is -.	Pick one:	A) 1/2	B) 1/10	C) 1/3	D) 1/8	E) 1/5
10 books arranged ==&gt;9!2!   req prob = 1/5   ANSW1/5R 1/5
<result>E</result>
10 books are placed at random in a shelf. The probability that a pair of books will always be together is -.