A carton contains 7 defective and 13 non-defective bulbs
MATHEMATICS · Multi-part · A Level · Mathematics · Probability · Probability
Problem
A carton contains 7 defective and 13 non-defective bulbs. Two bulbs are drawn one after another without replacement.
(a) Find the probability that both bulbs drawn are defective.
(b) Find the probability that exactly one of the two bulbs drawn is defective.
(c) If the first bulb drawn is defective, determine the probability that the second bulb is non-defective.