MATHEMATICS · Single correct · A Level · Mathematics · Probability · Probability
Problem
Urn I contains 3 black and 2 white balls, while Urn II contains 4 black and 5 white balls. One ball is transferred from Urn I to Urn II (without observing its colour). Then one ball is drawn from Urn II. What is the probability that this drawn ball is black?
(a) 21
(b) 5023
(c) 52
(d) 94