There are 4 physics books and 1 chemistry book on shelf P and 3 physics books on shelf Q. One book is moved from shelf P to shelf Q. A student picks up a book from shelf Q. What is the probability that the chemistry book is taken by the student?
Choose the correct choice from the following options.
A) 1/9
B) 1/10
C) 1/12
D) 1/15
E) 1/20
P(a chemistry book is moved to shelf Q) = 1/5   P(a chemistry book is then chosen from shelf Q) = 1/4   P(the student takes a chemistry book) = 1/5 * 1/4 = 1/20   The answer is 1/20.
<result>E</result>
There are 4 physics books and 1 chemistry book on shelf P and 3 physics books on shelf Q. One book is moved from shelf P to shelf Q. A student picks up a book from shelf Q. What is the probability that the chemistry book is taken by the student?