(a) Events A and B are such that
P(A)=‌

1

2

,P(B)=‌

7

12

‌ and ‌P(A∪B)=‌

1

4

Find whether the events A and B are independent or not.
OR
(b) A bux B1 contains 1 whitc ball and 3 red balls. Another box B2 contains 2 white balls and 3 red balls. If one ball is drawn at random from each of the boxes B1 and B2, then find the probability that the two balls drawn are of the same colour.