Let us compare the strengths and fighting techniques of both. The Black Mamba is slender, long, venomous snake with low weight. It can grow around 4.5 meter and weights about 1.6 Kg. read more
So it’s hard to know whether the ferret would be able to face the Black Mamba the same way as a mongoose. However, I have owned ferrets for 17 years so I can tell you that yes, their teeth are very sharp. read more
The King Cobra would win - it’s the longest venomous snake out there, and eats snakes for supper. While the Black Mamba isn’t an ordinary snake, in front of a King Cobra, it will falter, and fall/be eaten. I remember reading an article/interview of a herpetologist who accidentally placed a Black Mamba and a King Cobra in the same enclosure. read more