There are 5 physics books and 1 chemistry book on shelf P and 4 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 most appropriate option
A) 1/40	B) 1/35	C) 1/30	D) 1/25	E) 1/20
P(a chemistry book is moved to shelf Q) = 1/6   P(a chemistry book is then chosen from shelf Q) = 1/5   P(the student takes a chemistry book) = 1/6 * 1/5 = 1/30   The answer is 1/30.
<result>C</result>
There are 5 physics books and 1 chemistry book on shelf P and 4 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?