A box has 5 black b***s and 7 green b***s.two b***s are drawn from the box without replacement,find the probability that both b***s drawn ar

There are a total of 12 b***s of which 5 are black.

With replacement: 

$$\frac{5}{12}*\frac{5}{12}=\mathbf{\frac{25}{144}}.$$

Without replacement

$$\frac{5}{12}\times \frac{4}{11}=\frac{20}{121}$$