A sock drawer contains seven socks, each one a different solid color. The colors of the socks are yellow, green, blue, indigo, and violet. A person reaches into the drawer, pulls out two socks, and puts a single sock on each foot. If each sock can fit either the left or the right foot, and if it matters whether a particular sock is on the left or the right foot, how many different sock fashion combinations could the person make from the five socks? Select:
A) 12
B) 15
C) 21
D) 36
E) 20
It's a question of permutation since order matters here ....   It can be deduced to-   5P2 = 5!/3! = 5*4= 
<gadget id="calculator">5*4</gadget>
<output>20</output>
20 .........Answer is - 20
<result>E</result>
A sock drawer contains seven socks, each one a different solid color. The colors of the socks are yellow, green, blue, indigo, and violet. A person reaches into the drawer, pulls out two socks, and puts a single sock on each foot. If each sock can fit either the left or the right foot, and if it matters whether a particular sock is on the left or the right foot, how many different sock fashion combinations could the person make from the five socks?