Question

In a shelf there are $2$ different physics books and $3$ different chemistry books. The number of ways in which a student can select a physics book and chemistry book is:

• A. $6$
• B. $7$
• C. $8$
• D. $9$

Answer 1

The correct option is A $6$

A student can select physics book and a chemistry book in $2\times 3=6$ ways as explained below. Let the physics books be $P_1,P_2$ and chemistry books be $C_1,C_2,C_3.$
The six selections are $P_1{C}_1,P_1{C}_2,P_1{C}_3,P_2{C}_1,P_2{C}_2,P_2{C}_3$