(a) Events $\mathit{A}$ and $\mathit{B}$ are such that

Find whether the events $\mathit{A}$ and $\mathit{B}$ are independent or not.
OR
(b) A bux ${\mathrm{B}}_1$ contains 1 whitc ball and 3 red balls. Another box ${\mathrm{B}}_2$ contains 2 white balls and 3 red balls. If one ball is drawn at random from each of the boxes ${\mathit{B}}_1$ and ${\mathit{B}}_2$, then find the probability that the two balls drawn are of the same colour.