First pear       Second pear   probability
green (3/7)---------green (2/6)Â Â Â Â Â (3/7)*(2/6) = 1/7
          ---------red (4/6)       (3/7) *(4/6) = 2/7
red (4/7)-------------green (3/6)Â Â Â Â (4/7)*(3/6) = 2/7
       -------------red (3/6)       (4/7)*(3/6) = 2/7
                           -------------------------
                           1/7 + 2/7 + 2/7 + 2/7 = 1
The probailities that two are green are: 1/7
The probabilities that one is green and the other is red are:2 /7 + 2/7 = 4/7
The probabilities that two are red are: 2/7