A boy has 9 trousers and 20 shirts. In how many different ways can he select a trouser and a shirt?	Options
A) 180  B) 102  C) 104  D) 108  E) 110
The boy can select one trouser in nine ways.   The boy can select one shirt in 12 ways.   The number of ways in which he can select one trouser and one shirt is   9 * 20= 
<gadget id="calculator">  9 * 20</gadget>
<output>180</output>
180 ways.   180
<result>A</result>
A boy has 9 trousers and 20 shirts. In how many different ways can he select a trouser and a shirt?