whats the probability of gatting a matching pair of socks if there are 8 gree and 10 blue

Answer 1

I assume you mean that only two socks are going to be drawn?

p = 8/18*10/17 + 10/18*8/17 = 80/153 = 0.523

That is, it's the chance of getting a green, then a blue plus the chance of getting a blue, then a green