Company $\text{X}$ shipped $5$ computer chips, $1$ of which was defective. and company $\text{Y}$ shipped $4$ computer chips, $2$ of which were defective. One computer chip is to be chosen uniformly at a random from the $9$ chips shipped by the companies. If the chosen chip is found to be defective, what is the probability that the chip came from the company $\text{Y}?$
- $2/9$
- $4/9$
- $2/3$
- $1/2$