Probability of selecting a pony is 14/26. If the first horse selected is a pony, the probability of the next horse being a pony is 13/25...and so on. So,
P(all 7 horse being ponies)=(14/26)*(13/25)*(12/24)*(11/23)*(10/22)*(9/21)*(8/20) = 0.0052
Probability of selecting a pony is 14/26. If the first horse selected is a pony, the probability of the next horse being a pony is 13/25...and so on. So,
P(all 7 horse being ponies)=(14/26)*(13/25)*(12/24)*(11/23)*(10/22)*(9/21)*(8/20) = 0.0052