
Mike D. answered 10/11/20
Effective, patient, empathic, math and science tutor
7 birds. We can choose 3 of them in 7 C 3 ways
If a parrot is one of them, and we pick a canary, there are only 5 ways to do this (we can pick the 3rd bird in 5 ways)
So probability is 5 / (7 C 4)

Mike D.
Sorry 5 / (7 C 3)10/11/20