Question

There are 4 different mathematics books, 5 different physical science books and 3 different biological science books on a shelf. What is the probability of selecting a mathematics book from the shelf?

• A. $\frac{1}{3}$
• B. $\frac{1}{2}$
• C. $\frac{1}{4}$
• D. $\frac{5}{12}$

Answer 1

Answer: (A)

(i) Number of favourable outcomes $=4$.
(ii) Required probability
$=\frac{\text { Number of mathematics books }}{\text { Total number of books in the shelf }} \text {. }$