A certain office supply store stocks 2 sizes of self-stick notepads, each in 5 colors. The store packs the notepads in packages that contain either 3 notepads of the same size and the same color or 3 notepads of the same size and of 3 different colors. If the order in which the colors are packed is not considered, how many different packages of the types described above are possible?  Choose the correct choice:
A) 6
B) 8
C) 16
D) 20
E) 30
Notepads of the same color = 5 (we have 5 colors). As we have two sizes then total for the same color=5*2= 
<gadget id="calculator">5*2</gadget>
<output>10</output>
10   Notepads of the different colors= 5C3=10 (we should choose 3 different colors out of 5). As we have two sizes then total for the different color=10*2= 
<gadget id="calculator">10*2</gadget>
<output>20</output>
20   Total=10+20= 
<gadget id="calculator">10+20</gadget>
<output>30</output>
30   Answer: 30.
<result>E</result>
A certain office supply store stocks 2 sizes of self-stick notepads, each in 5 colors. The store packs the notepads in packages that contain either 3 notepads of the same size and the same color or 3 notepads of the same size and of 3 different colors. If the order in which the colors are packed is not considered, how many different packages of the types described above are possible?