Janet has 10 pairs of specialty socks, each pair in a different color. Suppose she randomly picks two out of the drawer without looking, what is the probability thatthe two socks are a matching pair?

the first one can be any colour, what is the chance of the second one being the same?

You have asked dozens of these.

If you have not just copied and pasted, which I think is your favoured method, then you would have learned something.

1/20?

Almost.

You certainly only have one sock of the right colour in the mix so the 1 is correct.

But it would be put over the total number of REMAINING socks.

You took one out already so there are not 20 socks to choose from.