What is the vertex of the quadratic function with a positive a value? A) (2,3)
B) (3,2)
C) (-4,-4)
D (-1,-0.5)

On your first pick, the chance of picking a white sock is  711  (there are  11  socks in total). On the next selection, the chance of picking white is  610  ( 1  white sock has been removed). So the chance of  2  whites is  711×610  which is  42110

Similarly, the chance of picking two blacks is  411×310  which is  12/110

The chance of picking two equal socks is the sum of these probabilities, that is:  54/110

This simplifies to  27/55