Dan has a membership at a local gym that also gives classes three nights a week. On any given class night, Dan has the option of taking yoga, weight training, or kickboxing classes. If Dan decides to go to either one or two classes per week, how many different combinations W of classes are available? Choose the correct option
A) 3  B) 6  C) W=7  D) W=9  E) W=12
I think it should be E only.   No where it is given that he attends different classes on each day.   Experts please provide your views.   --- EDITED my Response. It was a typo. I meant 12 is the answer.   If only W=9ay 1 : 3 options   If W=9ay 1 and W=9ay 2 : 3*3= 
<gadget id="calculator">3*3</gadget>
<output>9</output>
9 Options   So, Total= 3+9= 
<gadget id="calculator">3+9</gadget>
<output>12</output>
12.
<result>D</result>
Dan has a membership at a local gym that also gives classes three nights a week. On any given class night, Dan has the option of taking yoga, weight training, or kickboxing classes. If Dan decides to go to either one or two classes per week, how many different combinations W of classes are available?